6656657165 has 16 divisors (see below), whose sum is σ = 8146919088. Its totient is φ = 5219575296.

The previous prime is 6656657113. The next prime is 6656657177. The reversal of 6656657165 is 5617566566.

It can be written as a sum of positive squares in 8 ways, for example, as 1186871401 + 5469785764 = 34451^2 + 73958^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656657165 - 2¹⁰ = 6656656141 is a prime.

It is a super-2 number, since 2×6656657165² = 88622169224691674450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261587 + ... + 285903.

It is an arithmetic number, because the mean of its divisors is an integer number (509182443).

Almost surely, 2^6656657165 is an apocalyptic number.

It is an amenable number.

6656657165 is a deficient number, since it is larger than the sum of its proper divisors (1490261923).

6656657165 is a wasteful number, since it uses less digits than its factorization.

6656657165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25408.

The product of its digits is 6804000, while the sum is 53.

The square root of 6656657165 is about 81588.3396387008. The cubic root of 6656657165 is about 1881.1296557859.

The spelling of 6656657165 in words is "six billion, six hundred fifty-six million, six hundred fifty-seven thousand, one hundred sixty-five".