25938651866940 has 36 divisors (see below), whose sum is σ = 78680577330264. Its totient is φ = 6916973831136.

The previous prime is 25938651866849. The next prime is 25938651866951. The reversal of 25938651866940 is 4966815683952.

It is a happy number.

25938651866940 is a `hidden beast` number, since 2 + 5 + 9 + 3 + 8 + 6 + 518 + 6 + 69 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72051810562 + ... + 72051810921.

Almost surely, 2^{25938651866940} is an apocalyptic number.

25938651866940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25938651866940 is an abundant number, since it is smaller than the sum of its proper divisors (52741925463324).

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

25938651866940 is a wasteful number, since it uses less digits than its factorization.

25938651866940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144103621498 (or 144103621493 counting only the distinct ones).

The product of its (nonzero) digits is 671846400, while the sum is 72.

The spelling of 25938651866940 in words is "twenty-five trillion, nine hundred thirty-eight billion, six hundred fifty-one million, eight hundred sixty-six thousand, nine hundred forty".