23188665779 has 2 divisors, whose sum is σ = 23188665780. Its totient is φ = 23188665778.

The previous prime is 23188665761. The next prime is 23188665793. The reversal of 23188665779 is 97756688132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23188665779 is a prime.

It is a super-2 number, since 2×23188665779² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23188665679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11594332889 + 11594332890.

It is an arithmetic number, because the mean of its divisors is an integer number (11594332890).

Almost surely, 2^23188665779 is an apocalyptic number.

23188665779 is a deficient number, since it is larger than the sum of its proper divisors (1).

23188665779 is an equidigital number, since it uses as much as digits as its factorization.

23188665779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 62.

The spelling of 23188665779 in words is "twenty-three billion, one hundred eighty-eight million, six hundred sixty-five thousand, seven hundred seventy-nine".