18540990975 has 48 divisors (see below), whose sum is σ = 33041308832. Its totient is φ = 9119900160.

The previous prime is 18540990953. The next prime is 18540990997. The reversal of 18540990975 is 57909904581.

It is an interprime number because it is at equal distance from previous prime (18540990953) and next prime (18540990997).

It is not a de Polignac number, because 18540990975 - 2⁸ = 18540990719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1198389 + ... + 1213761.

Almost surely, 2^18540990975 is an apocalyptic number.

18540990975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18540990975 is a deficient number, since it is larger than the sum of its proper divisors (14500317857).

18540990975 is a wasteful number, since it uses less digits than its factorization.

18540990975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16636 (or 16631 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 57.

The spelling of 18540990975 in words is "eighteen billion, five hundred forty million, nine hundred ninety thousand, nine hundred seventy-five".