656343172 has 6 divisors (see below), whose sum is σ = 1148600558. Its totient is φ = 328171584.

The previous prime is 656343169. The next prime is 656343187. The reversal of 656343172 is 271343656.

It can be written as a sum of positive squares in only one way, i.e., 643839876 + 12503296 = 25374^2 + 3536^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82042893 + ... + 82042900.

Almost surely, 2^656343172 is an apocalyptic number.

It is an amenable number.

656343172 is a deficient number, since it is larger than the sum of its proper divisors (492257386).

656343172 is a wasteful number, since it uses less digits than its factorization.

656343172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164085797 (or 164085795 counting only the distinct ones).

The product of its digits is 90720, while the sum is 37.

The square root of 656343172 is about 25619.1953815884. The cubic root of 656343172 is about 869.0477854157.

The spelling of 656343172 in words is "six hundred fifty-six million, three hundred forty-three thousand, one hundred seventy-two".