656973925 has 24 divisors (see below), whose sum is σ = 907977600. Its totient is φ = 468622080.

The previous prime is 656973923. The next prime is 656973937. The reversal of 656973925 is 529379656.

It is not a de Polignac number, because 656973925 - 2¹ = 656973923 is a prime.

It is a super-2 number, since 2×656973925² = 863229476259811250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656973923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32605 + ... + 48754.

It is an arithmetic number, because the mean of its divisors is an integer number (37832400).

Almost surely, 2^656973925 is an apocalyptic number.

It is an amenable number.

656973925 is a deficient number, since it is larger than the sum of its proper divisors (251003675).

656973925 is a wasteful number, since it uses less digits than its factorization.

656973925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81405 (or 81400 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 52.

The square root of 656973925 is about 25631.5025895869. The cubic root of 656973925 is about 869.3260844421.

The spelling of 656973925 in words is "six hundred fifty-six million, nine hundred seventy-three thousand, nine hundred twenty-five".