621947998056 has 64 divisors (see below), whose sum is σ = 1938539220480. Its totient is φ = 161544934080.

The previous prime is 621947998019. The next prime is 621947998109. The reversal of 621947998056 is 650899749126.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 168274126 + ... + 168277821.

It is an arithmetic number, because the mean of its divisors is an integer number (30289675320).

Almost surely, 2^621947998056 is an apocalyptic number.

621947998056 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

621947998056 is an abundant number, since it is smaller than the sum of its proper divisors (1316591222424).

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

621947998056 is a wasteful number, since it uses less digits than its factorization.

621947998056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336551974 (or 336551970 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 66.

The spelling of 621947998056 in words is "six hundred twenty-one billion, nine hundred forty-seven million, nine hundred ninety-eight thousand, fifty-six".