621937645902 has 160 divisors (see below), whose sum is σ = 1490013569088. Its totient is φ = 193216057344.

The previous prime is 621937645897. The next prime is 621937645921. The reversal of 621937645902 is 209546739126.

621937645902 is a `hidden beast` number, since 6 + 2 + 19 + 37 + 6 + 4 + 590 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 172423383 + ... + 172426989.

Almost surely, 2^621937645902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621937645902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745006784544).

621937645902 is an abundant number, since it is smaller than the sum of its proper divisors (868075923186).

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

621937645902 is a wasteful number, since it uses less digits than its factorization.

621937645902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232 (or 4223 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 621937645902 in words is "six hundred twenty-one billion, nine hundred thirty-seven million, six hundred forty-five thousand, nine hundred two".