656772612 has 12 divisors (see below), whose sum is σ = 1532469456. Its totient is φ = 218924200.

The previous prime is 656772559. The next prime is 656772617. The reversal of 656772612 is 216277656.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (656772617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27365514 + ... + 27365537.

It is an arithmetic number, because the mean of its divisors is an integer number (127705788).

Almost surely, 2^656772612 is an apocalyptic number.

It is an amenable number.

656772612 is an abundant number, since it is smaller than the sum of its proper divisors (875696844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656772612 is a wasteful number, since it uses less digits than its factorization.

656772612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54731058 (or 54731056 counting only the distinct ones).

The product of its digits is 211680, while the sum is 42.

The square root of 656772612 is about 25627.5752266967. The cubic root of 656772612 is about 869.2372810595.

The spelling of 656772612 in words is "six hundred fifty-six million, seven hundred seventy-two thousand, six hundred twelve".