25500085681 has 4 divisors (see below), whose sum is σ = 29142955072. Its totient is φ = 21857216292.

The previous prime is 25500085643. The next prime is 25500085691. The reversal of 25500085681 is 18658000552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25500085681 - 2²⁵ = 25466531249 is a prime.

It is a super-2 number, since 2×25500085681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25500085691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821434685 + ... + 1821434698.

It is an arithmetic number, because the mean of its divisors is an integer number (7285738768).

Almost surely, 2^25500085681 is an apocalyptic number.

It is an amenable number.

25500085681 is a deficient number, since it is larger than the sum of its proper divisors (3642869391).

25500085681 is an equidigital number, since it uses as much as digits as its factorization.

25500085681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642869390.

The product of its (nonzero) digits is 96000, while the sum is 40.

The spelling of 25500085681 in words is "twenty-five billion, five hundred million, eighty-five thousand, six hundred eighty-one".