25591256163 has 12 divisors (see below), whose sum is σ = 40325615928. Its totient is φ = 15509852160.

The previous prime is 25591256147. The next prime is 25591256177. The reversal of 25591256163 is 36165219552.

25591256163 is a `hidden beast` number, since 2 + 5 + 5 + 9 + 1 + 25 + 616 + 3 = 666.

It is not a de Polignac number, because 25591256163 - 2⁴ = 25591256147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25591256143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129248670 + ... + 129248867.

It is an arithmetic number, because the mean of its divisors is an integer number (3360467994).

Almost surely, 2^25591256163 is an apocalyptic number.

25591256163 is a deficient number, since it is larger than the sum of its proper divisors (14734359765).

25591256163 is a wasteful number, since it uses less digits than its factorization.

25591256163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258497554 (or 258497551 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The spelling of 25591256163 in words is "twenty-five billion, five hundred ninety-one million, two hundred fifty-six thousand, one hundred sixty-three".