23256975809 has 2 divisors, whose sum is σ = 23256975810. Its totient is φ = 23256975808.

The previous prime is 23256975793. The next prime is 23256975811. The reversal of 23256975809 is 90857965232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21402812209 + 1854163600 = 146297^2 + 43060^2 .

It is a cyclic number.

It is not a de Polignac number, because 23256975809 - 2⁴ = 23256975793 is a prime.

It is a super-2 number, since 2×23256975809² (a number of 22 digits) contains 22 as substring.

Together with 23256975811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23256975109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11628487904 + 11628487905.

It is an arithmetic number, because the mean of its divisors is an integer number (11628487905).

Almost surely, 2^23256975809 is an apocalyptic number.

It is an amenable number.

23256975809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23256975809 is an equidigital number, since it uses as much as digits as its factorization.

23256975809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 56.

The spelling of 23256975809 in words is "twenty-three billion, two hundred fifty-six million, nine hundred seventy-five thousand, eight hundred nine".