23156429999 has 2 divisors, whose sum is σ = 23156430000. Its totient is φ = 23156429998.

The previous prime is 23156429839. The next prime is 23156430007. The reversal of 23156429999 is 99992465132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23156429999 - 2²⁸ = 22887994543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23156429399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11578214999 + 11578215000.

It is an arithmetic number, because the mean of its divisors is an integer number (11578215000).

Almost surely, 2^23156429999 is an apocalyptic number.

23156429999 is a deficient number, since it is larger than the sum of its proper divisors (1).

23156429999 is an equidigital number, since it uses as much as digits as its factorization.

23156429999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 59.

The spelling of 23156429999 in words is "twenty-three billion, one hundred fifty-six million, four hundred twenty-nine thousand, nine hundred ninety-nine".