25896657680 has 40 divisors (see below), whose sum is σ = 60328114200. Its totient is φ = 10338295808.

The previous prime is 25896657667. The next prime is 25896657701. The reversal of 25896657680 is 8675669852.

It can be written as a sum of positive squares in 4 ways, for example, as 9377210896 + 16519446784 = 96836^2 + 128528^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277265 + ... + 358704.

It is an arithmetic number, because the mean of its divisors is an integer number (1508202855).

Almost surely, 2^25896657680 is an apocalyptic number.

25896657680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25896657680 is an abundant number, since it is smaller than the sum of its proper divisors (34431456520).

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

25896657680 is a wasteful number, since it uses less digits than its factorization.

25896657680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636491 (or 636485 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 62.

The spelling of 25896657680 in words is "twenty-five billion, eight hundred ninety-six million, six hundred fifty-seven thousand, six hundred eighty".