621560608865 has 32 divisors (see below), whose sum is σ = 870112320000. Its totient is φ = 426070943424.

The previous prime is 621560608849. The next prime is 621560608901. The reversal of 621560608865 is 568806065126.

It is not a de Polignac number, because 621560608865 - 2⁴ = 621560608849 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5221631 + ... + 5339339.

It is an arithmetic number, because the mean of its divisors is an integer number (27191010000).

Almost surely, 2^621560608865 is an apocalyptic number.

It is an amenable number.

621560608865 is a deficient number, since it is larger than the sum of its proper divisors (248551711135).

621560608865 is a wasteful number, since it uses less digits than its factorization.

621560608865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120814 (or 120800 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 621560608865 in words is "six hundred twenty-one billion, five hundred sixty million, six hundred eight thousand, eight hundred sixty-five".