18463238272 has 16 divisors (see below), whose sum is σ = 36782232750. Its totient is φ = 9231619072.

The previous prime is 18463238231. The next prime is 18463238291. The reversal of 18463238272 is 27283236481.

It can be written as a sum of positive squares in only one way, i.e., 17228137536 + 1235100736 = 131256^2 + 35144^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72121897 + ... + 72122152.

Almost surely, 2^18463238272 is an apocalyptic number.

It is an amenable number.

18463238272 is a deficient number, since it is larger than the sum of its proper divisors (18318994478).

18463238272 is an equidigital number, since it uses as much as digits as its factorization.

18463238272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144244063 (or 144244051 counting only the distinct ones).

The product of its digits is 774144, while the sum is 46.

The spelling of 18463238272 in words is "eighteen billion, four hundred sixty-three million, two hundred thirty-eight thousand, two hundred seventy-two".