18618330931 has 2 divisors, whose sum is σ = 18618330932. Its totient is φ = 18618330930.

The previous prime is 18618330911. The next prime is 18618330943. The reversal of 18618330931 is 13903381681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18618330931 - 2²⁷ = 18484113203 is a prime.

It is a super-2 number, since 2×18618330931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18618330911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309165465 + 9309165466.

It is an arithmetic number, because the mean of its divisors is an integer number (9309165466).

Almost surely, 2^18618330931 is an apocalyptic number.

18618330931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618330931 is an equidigital number, since it uses as much as digits as its factorization.

18618330931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 18618330931 in words is "eighteen billion, six hundred eighteen million, three hundred thirty thousand, nine hundred thirty-one".