25631708641 has 32 divisors (see below), whose sum is σ = 33689272320. Its totient is φ = 18917150400.

The previous prime is 25631708633. The next prime is 25631708749. The reversal of 25631708641 is 14680713652.

It is a cyclic number.

It is not a de Polignac number, because 25631708641 - 2³ = 25631708633 is a prime.

It is a super-2 number, since 2×25631708641² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25631702641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2046 + ... + 226423.

It is an arithmetic number, because the mean of its divisors is an integer number (1052789760).

Almost surely, 2^25631708641 is an apocalyptic number.

It is an amenable number.

25631708641 is a deficient number, since it is larger than the sum of its proper divisors (8057563679).

25631708641 is a wasteful number, since it uses less digits than its factorization.

25631708641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228565.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 25631708641 in words is "twenty-five billion, six hundred thirty-one million, seven hundred eight thousand, six hundred forty-one".