25517129723 has 2 divisors, whose sum is σ = 25517129724. Its totient is φ = 25517129722.

The previous prime is 25517129717. The next prime is 25517129731. The reversal of 25517129723 is 32792171552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25517129723 - 2⁸ = 25517129467 is a prime.

It is a super-2 number, since 2×25517129723² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25517129753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758564861 + 12758564862.

It is an arithmetic number, because the mean of its divisors is an integer number (12758564862).

Almost surely, 2^25517129723 is an apocalyptic number.

25517129723 is a deficient number, since it is larger than the sum of its proper divisors (1).

25517129723 is an equidigital number, since it uses as much as digits as its factorization.

25517129723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 44.

The spelling of 25517129723 in words is "twenty-five billion, five hundred seventeen million, one hundred twenty-nine thousand, seven hundred twenty-three".