25172315687 has 2 divisors, whose sum is σ = 25172315688. Its totient is φ = 25172315686.

The previous prime is 25172315681. The next prime is 25172315711. The reversal of 25172315687 is 78651327152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25172315687 - 2³² = 20877348391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25172315681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12586157843 + 12586157844.

It is an arithmetic number, because the mean of its divisors is an integer number (12586157844).

Almost surely, 2^25172315687 is an apocalyptic number.

25172315687 is a deficient number, since it is larger than the sum of its proper divisors (1).

25172315687 is an equidigital number, since it uses as much as digits as its factorization.

25172315687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 47.

The spelling of 25172315687 in words is "twenty-five billion, one hundred seventy-two million, three hundred fifteen thousand, six hundred eighty-seven".