656155772 has 12 divisors (see below), whose sum is σ = 1167097176. Its totient is φ = 322699440.

The previous prime is 656155699. The next prime is 656155781. The reversal of 656155772 is 277551656.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344338 + ... + 1344825.

It is an arithmetic number, because the mean of its divisors is an integer number (97258098).

Almost surely, 2^656155772 is an apocalyptic number.

It is an amenable number.

656155772 is a deficient number, since it is larger than the sum of its proper divisors (510941404).

656155772 is a wasteful number, since it uses less digits than its factorization.

656155772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689228 (or 2689226 counting only the distinct ones).

The product of its digits is 441000, while the sum is 44.

The square root of 656155772 is about 25615.5377066342. The cubic root of 656155772 is about 868.9650669719.

The spelling of 656155772 in words is "six hundred fifty-six million, one hundred fifty-five thousand, seven hundred seventy-two".