18731285512 has 16 divisors (see below), whose sum is σ = 35190168300. Its totient is φ = 9347240640.

The previous prime is 18731285497. The next prime is 18731285561. The reversal of 18731285512 is 21558213781.

It can be written as a sum of positive squares in 2 ways, for example, as 17383367716 + 1347917796 = 131846^2 + 36714^2 .

It is a super-2 number, since 2×18731285512² (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 3 ways as a sum of consecutive naturals, for example, 2295939 + ... + 2304082.

Almost surely, 2^18731285512 is an apocalyptic number.

It is an amenable number.

18731285512 is a deficient number, since it is larger than the sum of its proper divisors (16458882788).

18731285512 is a wasteful number, since it uses less digits than its factorization.

18731285512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600536 (or 4600532 counting only the distinct ones).

The product of its digits is 134400, while the sum is 43.

The spelling of 18731285512 in words is "eighteen billion, seven hundred thirty-one million, two hundred eighty-five thousand, five hundred twelve".