25997138668 has 24 divisors (see below), whose sum is σ = 45884805120. Its totient is φ = 12887664720.

The previous prime is 25997138641. The next prime is 25997138677. The reversal of 25997138668 is 86683179952.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163413 + ... + 280531.

It is an arithmetic number, because the mean of its divisors is an integer number (1911866880).

Almost surely, 2^25997138668 is an apocalyptic number.

It is an amenable number.

25997138668 is a deficient number, since it is larger than the sum of its proper divisors (19887666452).

25997138668 is a wasteful number, since it uses less digits than its factorization.

25997138668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117597 (or 117595 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 64.

The spelling of 25997138668 in words is "twenty-five billion, nine hundred ninety-seven million, one hundred thirty-eight thousand, six hundred sixty-eight".