25457981336 has 8 divisors (see below), whose sum is σ = 47733715020. Its totient is φ = 12728990664.

The previous prime is 25457981317. The next prime is 25457981359. The reversal of 25457981336 is 63318975452.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1591123826 + ... + 1591123841.

Almost surely, 2^25457981336 is an apocalyptic number.

It is an amenable number.

25457981336 is a deficient number, since it is larger than the sum of its proper divisors (22275733684).

25457981336 is a wasteful number, since it uses less digits than its factorization.

25457981336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182247673 (or 3182247669 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 53.

The spelling of 25457981336 in words is "twenty-five billion, four hundred fifty-seven million, nine hundred eighty-one thousand, three hundred thirty-six".