23687448557 has 2 divisors, whose sum is σ = 23687448558. Its totient is φ = 23687448556.

The previous prime is 23687448553. The next prime is 23687448641. The reversal of 23687448557 is 75584478632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18796684201 + 4890764356 = 137101^2 + 69934^2 .

It is a cyclic number.

It is not a de Polignac number, because 23687448557 - 2² = 23687448553 is a prime.

It is a super-2 number, since 2×23687448557² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23687448496 and 23687448505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23687448553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11843724278 + 11843724279.

It is an arithmetic number, because the mean of its divisors is an integer number (11843724279).

Almost surely, 2^23687448557 is an apocalyptic number.

It is an amenable number.

23687448557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23687448557 is an equidigital number, since it uses as much as digits as its factorization.

23687448557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45158400, while the sum is 59.

The spelling of 23687448557 in words is "twenty-three billion, six hundred eighty-seven million, four hundred forty-eight thousand, five hundred fifty-seven".