25861866136 has 16 divisors (see below), whose sum is σ = 48920124600. Its totient is φ = 12816499584.

The previous prime is 25861866109. The next prime is 25861866179. The reversal of 25861866136 is 63166816852.

It is a super-2 number, since 2×25861866136² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14303226 + ... + 14305033.

Almost surely, 2^25861866136 is an apocalyptic number.

It is an amenable number.

25861866136 is a deficient number, since it is larger than the sum of its proper divisors (23058258464).

25861866136 is a wasteful number, since it uses less digits than its factorization.

25861866136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28608378 (or 28608374 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 52.

The spelling of 25861866136 in words is "twenty-five billion, eight hundred sixty-one million, eight hundred sixty-six thousand, one hundred thirty-six".