18157382931 has 4 divisors (see below), whose sum is σ = 24209843912. Its totient is φ = 12104921952.

The previous prime is 18157382911. The next prime is 18157382993. The reversal of 18157382931 is 13928375181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18157382931 - 2²⁷ = 18023165203 is a prime.

It is a super-2 number, since 2×18157382931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18157382911) 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, 3026230486 + ... + 3026230491.

It is an arithmetic number, because the mean of its divisors is an integer number (6052460978).

Almost surely, 2^18157382931 is an apocalyptic number.

18157382931 is a deficient number, since it is larger than the sum of its proper divisors (6052460981).

18157382931 is an equidigital number, since it uses as much as digits as its factorization.

18157382931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6052460980.

The product of its digits is 362880, while the sum is 48.

The spelling of 18157382931 in words is "eighteen billion, one hundred fifty-seven million, three hundred eighty-two thousand, nine hundred thirty-one".