23645975729 has 4 divisors (see below), whose sum is σ = 23697268980. Its totient is φ = 23594682480.

The previous prime is 23645975719. The next prime is 23645975807. The reversal of 23645975729 is 92757954632.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14580079504 + 9065896225 = 120748^2 + 95215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23645975729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23645975719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25645934 + ... + 25646855.

It is an arithmetic number, because the mean of its divisors is an integer number (5924317245).

Almost surely, 2^23645975729 is an apocalyptic number.

It is an amenable number.

23645975729 is a deficient number, since it is larger than the sum of its proper divisors (51293251).

23645975729 is an equidigital number, since it uses as much as digits as its factorization.

23645975729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51293250.

The product of its digits is 28576800, while the sum is 59.

The spelling of 23645975729 in words is "twenty-three billion, six hundred forty-five million, nine hundred seventy-five thousand, seven hundred twenty-nine".