23865553505257 has 2 divisors, whose sum is σ = 23865553505258. Its totient is φ = 23865553505256.

The previous prime is 23865553505249. The next prime is 23865553505281. The reversal of 23865553505257 is 75250535556832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19039399189056 + 4826154316201 = 4363416^2 + 2196851^2 .

It is a cyclic number.

It is not a de Polignac number, because 23865553505257 - 2³ = 23865553505249 is a prime.

It is a super-2 number, since 2×23865553505257² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23865553505195 and 23865553505204.

It is not a weakly prime, because it can be changed into another prime (23865553505207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11932776752628 + 11932776752629.

It is an arithmetic number, because the mean of its divisors is an integer number (11932776752629).

Almost surely, 2^{23865553505257} is an apocalyptic number.

It is an amenable number.

23865553505257 is a deficient number, since it is larger than the sum of its proper divisors (1).

23865553505257 is an equidigital number, since it uses as much as digits as its factorization.

23865553505257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000000, while the sum is 61.

The spelling of 23865553505257 in words is "twenty-three trillion, eight hundred sixty-five billion, five hundred fifty-three million, five hundred five thousand, two hundred fifty-seven".