23987808857 has 2 divisors, whose sum is σ = 23987808858. Its totient is φ = 23987808856.

The previous prime is 23987808841. The next prime is 23987808913. The reversal of 23987808857 is 75880878932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23297748496 + 690060361 = 152636^2 + 26269^2 .

It is a cyclic number.

It is not a de Polignac number, because 23987808857 - 2⁴ = 23987808841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23987808793 and 23987808802.

It is not a weakly prime, because it can be changed into another prime (23987808827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11993904428 + 11993904429.

It is an arithmetic number, because the mean of its divisors is an integer number (11993904429).

Almost surely, 2^23987808857 is an apocalyptic number.

It is an amenable number.

23987808857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23987808857 is an equidigital number, since it uses as much as digits as its factorization.

23987808857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54190080, while the sum is 65.

The spelling of 23987808857 in words is "twenty-three billion, nine hundred eighty-seven million, eight hundred eight thousand, eight hundred fifty-seven".