25608416690 has 32 divisors (see below), whose sum is σ = 47614731120. Its totient is φ = 9908884224.

The previous prime is 25608416677. The next prime is 25608416747. The reversal of 25608416690 is 9661480652.

It can be written as a sum of positive squares in 8 ways, for example, as 16941365281 + 8667051409 = 130159^2 + 93097^2 .

It is a super-2 number, since 2×25608416690² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136025 + ... + 264044.

Almost surely, 2^25608416690 is an apocalyptic number.

25608416690 is a deficient number, since it is larger than the sum of its proper divisors (22006314430).

25608416690 is a wasteful number, since it uses less digits than its factorization.

25608416690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400286.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 25608416690 in words is "twenty-five billion, six hundred eight million, four hundred sixteen thousand, six hundred ninety".