656662662864 has 180 divisors, whose sum is σ = 2045015535108. Its totient is φ = 195531770880.

The previous prime is 656662662809. The next prime is 656662662899. The reversal of 656662662864 is 468266266656.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 349848590400 + 306814072464 = 591480^2 + 553908^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1616484 + ... + 1981500.

Almost surely, 2^656662662864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656662662864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022507767554).

656662662864 is an abundant number, since it is smaller than the sum of its proper divisors (1388352872244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656662662864 is a wasteful number, since it uses less digits than its factorization.

656662662864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365106 (or 365066 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 63.

The spelling of 656662662864 in words is "six hundred fifty-six billion, six hundred sixty-two million, six hundred sixty-two thousand, eight hundred sixty-four".