18657894072 has 64 divisors (see below), whose sum is σ = 46851022080. Its totient is φ = 6191854592.

The previous prime is 18657894049. The next prime is 18657894083. The reversal of 18657894072 is 27049875681.

It is a super-2 number, since 2×18657894072² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7005013 + ... + 7007675.

It is an arithmetic number, because the mean of its divisors is an integer number (732047220).

Almost surely, 2^18657894072 is an apocalyptic number.

18657894072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18657894072 is an abundant number, since it is smaller than the sum of its proper divisors (28193128008).

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

18657894072 is a wasteful number, since it uses less digits than its factorization.

18657894072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852 (or 3848 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 18657894072 in words is "eighteen billion, six hundred fifty-seven million, eight hundred ninety-four thousand, seventy-two".