656991883804 has 24 divisors (see below), whose sum is σ = 1166950966160. Its totient is φ = 323577783936.

The previous prime is 656991883733. The next prime is 656991883859. The reversal of 656991883804 is 408388199656.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a self number, because there is not a number n which added to its sum of digits gives 656991883804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7478824 + ... + 7566160.

Almost surely, 2^656991883804 is an apocalyptic number.

It is an amenable number.

656991883804 is a deficient number, since it is larger than the sum of its proper divisors (509959082356).

656991883804 is a wasteful number, since it uses less digits than its factorization.

656991883804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115477 (or 115475 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 67.

The spelling of 656991883804 in words is "six hundred fifty-six billion, nine hundred ninety-one million, eight hundred eighty-three thousand, eight hundred four".