621909055936 has 56 divisors (see below), whose sum is σ = 1427393761920. Its totient is φ = 263321202432.

The previous prime is 621909055891. The next prime is 621909055961. The reversal of 621909055936 is 639550909126.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8325406 + ... + 8399773.

It is an arithmetic number, because the mean of its divisors is an integer number (25489174320).

Almost surely, 2^621909055936 is an apocalyptic number.

It is an amenable number.

621909055936 is an abundant number, since it is smaller than the sum of its proper divisors (805484705984).

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

621909055936 is a wasteful number, since it uses less digits than its factorization.

621909055936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16725281 (or 16725271 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 55.

The spelling of 621909055936 in words is "six hundred twenty-one billion, nine hundred nine million, fifty-five thousand, nine hundred thirty-six".