18311380072 has 16 divisors (see below), whose sum is σ = 34362160740. Its totient is φ = 9148137216.

The previous prime is 18311380063. The next prime is 18311380121. The reversal of 18311380072 is 27008311381.

It can be written as a sum of positive squares in 2 ways, for example, as 17594961316 + 716418756 = 132646^2 + 26766^2 .

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, 933793 + ... + 953200.

Almost surely, 2^18311380072 is an apocalyptic number.

It is an amenable number.

18311380072 is a deficient number, since it is larger than the sum of its proper divisors (16050780668).

18311380072 is a wasteful number, since it uses less digits than its factorization.

18311380072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888212 (or 1888208 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 18311380072 in words is "eighteen billion, three hundred eleven million, three hundred eighty thousand, seventy-two".