66115505 has 8 divisors (see below), whose sum is σ = 82074600. Its totient is φ = 51068416.

The previous prime is 66115487. The next prime is 66115507. The reversal of 66115505 is 50551166.

It can be written as a sum of positive squares in 4 ways, for example, as 327184 + 65788321 = 572^2 + 8111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66115505 - 2⁸ = 66115249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (66115507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227840 + ... + 228129.

It is an arithmetic number, because the mean of its divisors is an integer number (10259325).

Almost surely, 2^66115505 is an apocalyptic number.

It is an amenable number.

66115505 is a deficient number, since it is larger than the sum of its proper divisors (15959095).

66115505 is a wasteful number, since it uses less digits than its factorization.

66115505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456003.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66115505 is about 8131.1441384346. The cubic root of 66115505 is about 404.3596138758.

The spelling of 66115505 in words is "sixty-six million, one hundred fifteen thousand, five hundred five".