656643165 has 16 divisors (see below), whose sum is σ = 1056924288. Its totient is φ = 348111296.

The previous prime is 656643131. The next prime is 656643217. The reversal of 656643165 is 561346656.

656643165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 656643165 - 2¹⁸ = 656381021 is a prime.

It is a super-2 number, since 2×656643165² = 862360492282434450, which contains 22 as substring.

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, 128562 + ... + 133571.

It is an arithmetic number, because the mean of its divisors is an integer number (66057768).

Almost surely, 2^656643165 is an apocalyptic number.

It is an amenable number.

656643165 is a deficient number, since it is larger than the sum of its proper divisors (400281123).

656643165 is a wasteful number, since it uses less digits than its factorization.

656643165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262308.

The product of its digits is 388800, while the sum is 42.

The square root of 656643165 is about 25625.0495609277. The cubic root of 656643165 is about 869.1801696892.

The spelling of 656643165 in words is "six hundred fifty-six million, six hundred forty-three thousand, one hundred sixty-five".