621560608864 has 96 divisors (see below), whose sum is σ = 1388180717280. Its totient is φ = 271580884992.

The previous prime is 621560608849. The next prime is 621560608901. The reversal of 621560608864 is 468806065126.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11298994 + ... + 11353870.

It is an arithmetic number, because the mean of its divisors is an integer number (14460215805).

Almost surely, 2^621560608864 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 621560608864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694090358640).

621560608864 is an abundant number, since it is smaller than the sum of its proper divisors (766620108416).

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

621560608864 is a wasteful number, since it uses less digits than its factorization.

621560608864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56352 (or 56344 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 621560608864 in words is "six hundred twenty-one billion, five hundred sixty million, six hundred eight thousand, eight hundred sixty-four".