25597468609 has 2 divisors, whose sum is σ = 25597468610. Its totient is φ = 25597468608.

The previous prime is 25597468607. The next prime is 25597468627. The reversal of 25597468609 is 90686479552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23930543025 + 1666925584 = 154695^2 + 40828^2 .

It is a cyclic number.

It is not a de Polignac number, because 25597468609 - 2¹ = 25597468607 is a prime.

Together with 25597468607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25597468607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12798734304 + 12798734305.

It is an arithmetic number, because the mean of its divisors is an integer number (12798734305).

Almost surely, 2^25597468609 is an apocalyptic number.

It is an amenable number.

25597468609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25597468609 is an equidigital number, since it uses as much as digits as its factorization.

25597468609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32659200, while the sum is 61.

The spelling of 25597468609 in words is "twenty-five billion, five hundred ninety-seven million, four hundred sixty-eight thousand, six hundred nine".