18233708931 has 16 divisors (see below), whose sum is σ = 27015419520. Its totient is φ = 12154673160.

The previous prime is 18233708917. The next prime is 18233708939. The reversal of 18233708931 is 13980733281.

It is a happy number.

It is not a de Polignac number, because 18233708931 - 2⁷ = 18233708803 is a prime.

It is a super-2 number, since 2×18233708931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18233708939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345916 + ... + 395126.

It is an arithmetic number, because the mean of its divisors is an integer number (1688463720).

Almost surely, 2^18233708931 is an apocalyptic number.

18233708931 is a deficient number, since it is larger than the sum of its proper divisors (8781710589).

18233708931 is a wasteful number, since it uses less digits than its factorization.

18233708931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62943 (or 62937 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 18233708931 in words is "eighteen billion, two hundred thirty-three million, seven hundred eight thousand, nine hundred thirty-one".