25696602197 has 6 divisors (see below), whose sum is σ = 29891965878. Its totient is φ = 22025658984.

The previous prime is 25696602149. The next prime is 25696602221. The reversal of 25696602197 is 79120669652.

It can be written as a sum of positive squares in only one way, i.e., 25189181521 + 507420676 = 158711^2 + 22526^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25696602197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25696605197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262210178 + ... + 262210275.

It is an arithmetic number, because the mean of its divisors is an integer number (4981994313).

Almost surely, 2^25696602197 is an apocalyptic number.

It is an amenable number.

25696602197 is a deficient number, since it is larger than the sum of its proper divisors (4195363681).

25696602197 is an equidigital number, since it uses as much as digits as its factorization.

25696602197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524420467 (or 524420460 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 25696602197 in words is "twenty-five billion, six hundred ninety-six million, six hundred two thousand, one hundred ninety-seven".