621665612 has 12 divisors (see below), whose sum is σ = 1088636136. Its totient is φ = 310626720.

The previous prime is 621665593. The next prime is 621665633. The reversal of 621665612 is 216566126.

621665612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44633 + ... + 56880.

It is an arithmetic number, because the mean of its divisors is an integer number (90719678).

Almost surely, 2^621665612 is an apocalyptic number.

It is an amenable number.

621665612 is a deficient number, since it is larger than the sum of its proper divisors (466970524).

621665612 is a wasteful number, since it uses less digits than its factorization.

621665612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103048 (or 103046 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 621665612 is about 24933.2230567971. The cubic root of 621665612 is about 853.4648018607.

The spelling of 621665612 in words is "six hundred twenty-one million, six hundred sixty-five thousand, six hundred twelve".