25557675617 has 4 divisors (see below), whose sum is σ = 25705408020. Its totient is φ = 25409943216.

The previous prime is 25557675589. The next prime is 25557675631. The reversal of 25557675617 is 71657675552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13259752801 + 12297922816 = 115151^2 + 110896^2 .

It is a cyclic number.

It is not a de Polignac number, because 25557675617 - 2¹⁸ = 25557413473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25557675677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73865942 + ... + 73866287.

It is an arithmetic number, because the mean of its divisors is an integer number (6426352005).

Almost surely, 2^25557675617 is an apocalyptic number.

It is an amenable number.

25557675617 is a deficient number, since it is larger than the sum of its proper divisors (147732403).

25557675617 is a wasteful number, since it uses less digits than its factorization.

25557675617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147732402.

The product of its digits is 15435000, while the sum is 56.

The spelling of 25557675617 in words is "twenty-five billion, five hundred fifty-seven million, six hundred seventy-five thousand, six hundred seventeen".