25115651317 has 2 divisors, whose sum is σ = 25115651318. Its totient is φ = 25115651316.

The previous prime is 25115651293. The next prime is 25115651401. The reversal of 25115651317 is 71315651152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14745487761 + 10370163556 = 121431^2 + 101834^2 .

It is a cyclic number.

It is not a de Polignac number, because 25115651317 - 2⁷ = 25115651189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25115651017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12557825658 + 12557825659.

It is an arithmetic number, because the mean of its divisors is an integer number (12557825659).

Almost surely, 2^25115651317 is an apocalyptic number.

It is an amenable number.

25115651317 is a deficient number, since it is larger than the sum of its proper divisors (1).

25115651317 is an equidigital number, since it uses as much as digits as its factorization.

25115651317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 37.

The spelling of 25115651317 in words is "twenty-five billion, one hundred fifteen million, six hundred fifty-one thousand, three hundred seventeen".