656706254391 has 24 divisors (see below), whose sum is σ = 1036481696640. Its totient is φ = 397360774800.

The previous prime is 656706254381. The next prime is 656706254437. The reversal of 656706254391 is 193452607656.

656706254391 is a `hidden beast` number, since 6 + 5 + 6 + 7 + 0 + 6 + 2 + 543 + 91 = 666.

It is not a de Polignac number, because 656706254391 - 2⁷ = 656706254263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656706254381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5296875 + ... + 5419436.

It is an arithmetic number, because the mean of its divisors is an integer number (43186737360).

Almost surely, 2^656706254391 is an apocalyptic number.

656706254391 is a deficient number, since it is larger than the sum of its proper divisors (379775442249).

656706254391 is a wasteful number, since it uses less digits than its factorization.

656706254391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716947 (or 10716944 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 656706254391 in words is "six hundred fifty-six billion, seven hundred six million, two hundred fifty-four thousand, three hundred ninety-one".