25949921256 has 48 divisors (see below), whose sum is σ = 80321186400. Its totient is φ = 7414263072.

The previous prime is 25949921203. The next prime is 25949921267. The reversal of 25949921256 is 65212994952.

25949921256 is a `hidden beast` number, since 2 + 594 + 9 + 9 + 21 + 25 + 6 = 666.

It is a super-4 number, since 4×25949921256⁴ (a number of 43 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25743466 + ... + 25744473.

It is an arithmetic number, because the mean of its divisors is an integer number (1673358050).

Almost surely, 2^25949921256 is an apocalyptic number.

It is an amenable number.

25949921256 is an abundant number, since it is smaller than the sum of its proper divisors (54371265144).

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

25949921256 is a wasteful number, since it uses less digits than its factorization.

25949921256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51487958 (or 51487951 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 25949921256 in words is "twenty-five billion, nine hundred forty-nine million, nine hundred twenty-one thousand, two hundred fifty-six".