656621538896 has 20 divisors (see below), whose sum is σ = 1272220706592. Its totient is φ = 328306517856.

The previous prime is 656621538893. The next prime is 656621538901. The reversal of 656621538896 is 698835126656.

It is a hoax number, since the sum of its digits (65) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656621538893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281365 + ... + 1719051.

Almost surely, 2^656621538896 is an apocalyptic number.

It is an amenable number.

656621538896 is a deficient number, since it is larger than the sum of its proper divisors (615599167696).

656621538896 is a wasteful number, since it uses less digits than its factorization.

656621538896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531458 (or 531452 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 65.

The spelling of 656621538896 in words is "six hundred fifty-six billion, six hundred twenty-one million, five hundred thirty-eight thousand, eight hundred ninety-six".