18640846164 has 24 divisors (see below), whose sum is σ = 44019349920. Its totient is φ = 6138752224.

The previous prime is 18640846153. The next prime is 18640846177. The reversal of 18640846164 is 46164804681.

It is a super-2 number, since 2×18640846164² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9356859 + ... + 9358850.

It is an arithmetic number, because the mean of its divisors is an integer number (1834139580).

Almost surely, 2^18640846164 is an apocalyptic number.

It is an amenable number.

18640846164 is an abundant number, since it is smaller than the sum of its proper divisors (25378503756).

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

18640846164 is a wasteful number, since it uses less digits than its factorization.

18640846164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18715799 (or 18715797 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 18640846164 in words is "eighteen billion, six hundred forty million, eight hundred forty-six thousand, one hundred sixty-four".