25617649758605 has 4 divisors (see below), whose sum is σ = 30741179710332. Its totient is φ = 20494119806880.

The previous prime is 25617649758523. The next prime is 25617649758709. The reversal of 25617649758605 is 50685794671652.

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 8969054646244 + 16648595112361 = 2994838^2 + 4080269^2 .

It is not a de Polignac number, because 25617649758605 - 2¹² = 25617649754509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561764975856 + ... + 2561764975865.

It is an arithmetic number, because the mean of its divisors is an integer number (7685294927583).

Almost surely, 2^{25617649758605} is an apocalyptic number.

It is an amenable number.

25617649758605 is a deficient number, since it is larger than the sum of its proper divisors (5123529951727).

25617649758605 is an equidigital number, since it uses as much as digits as its factorization.

25617649758605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123529951726.

The product of its (nonzero) digits is 762048000, while the sum is 71.

The spelling of 25617649758605 in words is "twenty-five trillion, six hundred seventeen billion, six hundred forty-nine million, seven hundred fifty-eight thousand, six hundred five".