25920415957 has 2 divisors, whose sum is σ = 25920415958. Its totient is φ = 25920415956.

The previous prime is 25920415931. The next prime is 25920416023. The reversal of 25920415957 is 75951402952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25919068036 + 1347921 = 160994^2 + 1161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25920415957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25920415957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25920415907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960207978 + 12960207979.

It is an arithmetic number, because the mean of its divisors is an integer number (12960207979).

Almost surely, 2^25920415957 is an apocalyptic number.

It is an amenable number.

25920415957 is a deficient number, since it is larger than the sum of its proper divisors (1).

25920415957 is an equidigital number, since it uses as much as digits as its factorization.

25920415957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134000, while the sum is 49.

The spelling of 25920415957 in words is "twenty-five billion, nine hundred twenty million, four hundred fifteen thousand, nine hundred fifty-seven".