18139971332 has 12 divisors (see below), whose sum is σ = 36279942720. Its totient is φ = 7774273416.

The previous prime is 18139971301. The next prime is 18139971359. The reversal of 18139971332 is 23317993181.

18139971332 is an admirable number.

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, 323928032 + ... + 323928087.

It is an arithmetic number, because the mean of its divisors is an integer number (3023328560).

Almost surely, 2^18139971332 is an apocalyptic number.

It is an amenable number.

18139971332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18139971332 is a wasteful number, since it uses less digits than its factorization.

18139971332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647856130 (or 647856128 counting only the distinct ones).

The product of its digits is 244944, while the sum is 47.

The spelling of 18139971332 in words is "eighteen billion, one hundred thirty-nine million, nine hundred seventy-one thousand, three hundred thirty-two".