25257678868 has 24 divisors (see below), whose sum is σ = 46046468160. Its totient is φ = 12111986880.

The previous prime is 25257678833. The next prime is 25257678869. The reversal of 25257678868 is 86887675252.

It is a super-2 number, since 2×25257678868² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25257678869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1295496 + ... + 1314847.

It is an arithmetic number, because the mean of its divisors is an integer number (1918602840).

Almost surely, 2^25257678868 is an apocalyptic number.

It is an amenable number.

25257678868 is a deficient number, since it is larger than the sum of its proper divisors (20788789292).

25257678868 is a wasteful number, since it uses less digits than its factorization.

25257678868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610447 (or 2610445 counting only the distinct ones).

The product of its digits is 90316800, while the sum is 64.

The spelling of 25257678868 in words is "twenty-five billion, two hundred fifty-seven million, six hundred seventy-eight thousand, eight hundred sixty-eight".