25506515297 has 2 divisors, whose sum is σ = 25506515298. Its totient is φ = 25506515296.

The previous prime is 25506515197. The next prime is 25506515339. The reversal of 25506515297 is 79251560552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22392428881 + 3114086416 = 149641^2 + 55804^2 .

It is a cyclic number.

It is not a de Polignac number, because 25506515297 - 2³⁴ = 8326646113 is a prime.

It is not a weakly prime, because it can be changed into another prime (25506515197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753257648 + 12753257649.

It is an arithmetic number, because the mean of its divisors is an integer number (12753257649).

Almost surely, 2^25506515297 is an apocalyptic number.

It is an amenable number.

25506515297 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506515297 is an equidigital number, since it uses as much as digits as its factorization.

25506515297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945000, while the sum is 47.

The spelling of 25506515297 in words is "twenty-five billion, five hundred six million, five hundred fifteen thousand, two hundred ninety-seven".