25657261605256 has 16 divisors (see below), whose sum is σ = 50198990097600. Its totient is φ = 12270864245904.

The previous prime is 25657261605251. The next prime is 25657261605319. The reversal of 25657261605256 is 65250616275652.

It is a self number, because there is not a number n which added to its sum of digits gives 25657261605256.

It is not an unprimeable number, because it can be changed into a prime (25657261605251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69720819396 + ... + 69720819763.

It is an arithmetic number, because the mean of its divisors is an integer number (3137436881100).

Almost surely, 2^{25657261605256} is an apocalyptic number.

It is an amenable number.

25657261605256 is a deficient number, since it is larger than the sum of its proper divisors (24541728492344).

25657261605256 is a wasteful number, since it uses less digits than its factorization.

25657261605256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139441639188 (or 139441639184 counting only the distinct ones).

The product of its (nonzero) digits is 45360000, while the sum is 58.

The spelling of 25657261605256 in words is "twenty-five trillion, six hundred fifty-seven billion, two hundred sixty-one million, six hundred five thousand, two hundred fifty-six".