23155715657 has 8 divisors (see below), whose sum is σ = 24519172392. Its totient is φ = 21792409600.

The previous prime is 23155715641. The next prime is 23155715659. The reversal of 23155715657 is 75651755132.

It can be written as a sum of positive squares in 4 ways, for example, as 12534145936 + 10621569721 = 111956^2 + 103061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23155715657 - 2⁴ = 23155715641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23155715659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490157 + ... + 535317.

It is an arithmetic number, because the mean of its divisors is an integer number (3064896549).

Almost surely, 2^23155715657 is an apocalyptic number.

It is an amenable number.

23155715657 is a deficient number, since it is larger than the sum of its proper divisors (1363456735).

23155715657 is a wasteful number, since it uses less digits than its factorization.

23155715657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75339.

The product of its digits is 1102500, while the sum is 47.

The spelling of 23155715657 in words is "twenty-three billion, one hundred fifty-five million, seven hundred fifteen thousand, six hundred fifty-seven".