23859859865 has 4 divisors (see below), whose sum is σ = 28631831844. Its totient is φ = 19087887888.

The previous prime is 23859859831. The next prime is 23859859879. The reversal of 23859859865 is 56895895832.

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 18286341529 + 5573518336 = 135227^2 + 74656^2 .

It is a cyclic number.

It is not a de Polignac number, because 23859859865 - 2⁸ = 23859859609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23859859795 and 23859859804.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385985982 + ... + 2385985991.

It is an arithmetic number, because the mean of its divisors is an integer number (7157957961).

Almost surely, 2^23859859865 is an apocalyptic number.

It is an amenable number.

23859859865 is a deficient number, since it is larger than the sum of its proper divisors (4771971979).

23859859865 is an equidigital number, since it uses as much as digits as its factorization.

23859859865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4771971978.

The product of its digits is 186624000, while the sum is 68.

The spelling of 23859859865 in words is "twenty-three billion, eight hundred fifty-nine million, eight hundred fifty-nine thousand, eight hundred sixty-five".