18664320620 has 24 divisors (see below), whose sum is σ = 42758262288. Its totient is φ = 6787025600.

The previous prime is 18664320599. The next prime is 18664320637. The reversal of 18664320620 is 2602346681.

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 7 ways as a sum of consecutive naturals, for example, 42418691 + ... + 42419130.

It is an arithmetic number, because the mean of its divisors is an integer number (1781594262).

Almost surely, 2^18664320620 is an apocalyptic number.

18664320620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18664320620 is an abundant number, since it is smaller than the sum of its proper divisors (24093941668).

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

18664320620 is a wasteful number, since it uses less digits than its factorization.

18664320620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84837841 (or 84837839 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 18664320620 in words is "eighteen billion, six hundred sixty-four million, three hundred twenty thousand, six hundred twenty".