18910975137 has 4 divisors (see below), whose sum is σ = 25214633520. Its totient is φ = 12607316756.

The previous prime is 18910975129. The next prime is 18910975157. The reversal of 18910975137 is 73157901981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18910975137 - 2³ = 18910975129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18910975137.

It is not an unprimeable number, because it can be changed into a prime (18910975157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3151829187 + ... + 3151829192.

It is an arithmetic number, because the mean of its divisors is an integer number (6303658380).

Almost surely, 2^18910975137 is an apocalyptic number.

It is an amenable number.

18910975137 is a deficient number, since it is larger than the sum of its proper divisors (6303658383).

18910975137 is an equidigital number, since it uses as much as digits as its factorization.

18910975137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6303658382.

The product of its (nonzero) digits is 476280, while the sum is 51.

The spelling of 18910975137 in words is "eighteen billion, nine hundred ten million, nine hundred seventy-five thousand, one hundred thirty-seven".