22640188931 has 2 divisors, whose sum is σ = 22640188932. Its totient is φ = 22640188930.

The previous prime is 22640188919. The next prime is 22640188937. The reversal of 22640188931 is 13988104622.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22640188931 - 2⁶ = 22640188867 is a prime.

It is a super-2 number, since 2×22640188931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22640188937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11320094465 + 11320094466.

It is an arithmetic number, because the mean of its divisors is an integer number (11320094466).

Almost surely, 2^22640188931 is an apocalyptic number.

22640188931 is a deficient number, since it is larger than the sum of its proper divisors (1).

22640188931 is an equidigital number, since it uses as much as digits as its factorization.

22640188931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 22640188931 in words is "twenty-two billion, six hundred forty million, one hundred eighty-eight thousand, nine hundred thirty-one".