18668724072 has 32 divisors (see below), whose sum is σ = 46720132800. Its totient is φ = 6216465024.

The previous prime is 18668724059. The next prime is 18668724119. The reversal of 18668724072 is 27042786681.

It is a super-2 number, since 2×18668724072² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378997 + ... + 425412.

It is an arithmetic number, because the mean of its divisors is an integer number (1460004150).

Almost surely, 2^18668724072 is an apocalyptic number.

18668724072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18668724072 is an abundant number, since it is smaller than the sum of its proper divisors (28051408728).

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

18668724072 is a wasteful number, since it uses less digits than its factorization.

18668724072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805385 (or 805381 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 18668724072 in words is "eighteen billion, six hundred sixty-eight million, seven hundred twenty-four thousand, seventy-two".