25809256676 has 18 divisors (see below), whose sum is σ = 52540272918. Its totient is φ = 11061109920.

The previous prime is 25809256663. The next prime is 25809256751. The reversal of 25809256676 is 67665290852.

It can be written as a sum of positive squares in only one way, i.e., 23325231076 + 2484025600 = 152726^2 + 49840^2 .

It is a super-2 number, since 2×25809256676² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65839745 + ... + 65840136.

It is an arithmetic number, because the mean of its divisors is an integer number (2918904051).

Almost surely, 2^25809256676 is an apocalyptic number.

It is an amenable number.

25809256676 is an abundant number, since it is smaller than the sum of its proper divisors (26731016242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25809256676 is a wasteful number, since it uses less digits than its factorization.

25809256676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131679899 (or 131679890 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 25809256676 in words is "twenty-five billion, eight hundred nine million, two hundred fifty-six thousand, six hundred seventy-six".