25317617393 has 2 divisors, whose sum is σ = 25317617394. Its totient is φ = 25317617392.

The previous prime is 25317617341. The next prime is 25317617407. The reversal of 25317617393 is 39371671352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24213849664 + 1103767729 = 155608^2 + 33223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25317617393 is a prime.

It is a super-2 number, since 2×25317617393² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25317617093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12658808696 + 12658808697.

It is an arithmetic number, because the mean of its divisors is an integer number (12658808697).

Almost surely, 2^25317617393 is an apocalyptic number.

It is an amenable number.

25317617393 is a deficient number, since it is larger than the sum of its proper divisors (1).

25317617393 is an equidigital number, since it uses as much as digits as its factorization.

25317617393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 47.

The spelling of 25317617393 in words is "twenty-five billion, three hundred seventeen million, six hundred seventeen thousand, three hundred ninety-three".