621955685422368 has 1344 divisors, whose sum is σ = 2182405026816000. Its totient is φ = 172776975091200.

The previous prime is 621955685422327. The next prime is 621955685422411. The reversal of 621955685422368 is 863224586559126.

621955685422368 is a `hidden beast` number, since 6 + 2 + 1 + 9 + 5 + 56 + 8 + 542 + 23 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 621955685422296 and 621955685422305.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 54562296733 + ... + 54562308131.

It is an arithmetic number, because the mean of its divisors is an integer number (1623813264000).

Almost surely, 2^{621955685422368} 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 621955685422368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091202513408000).

621955685422368 is an abundant number, since it is smaller than the sum of its proper divisors (1560449341393632).

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

621955685422368 is a wasteful number, since it uses less digits than its factorization.

621955685422368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11526 (or 11465 counting only the distinct ones).

The product of its digits is 1492992000, while the sum is 72.

The spelling of 621955685422368 in words is "six hundred twenty-one trillion, nine hundred fifty-five billion, six hundred eighty-five million, four hundred twenty-two thousand, three hundred sixty-eight".