25979172813 has 24 divisors (see below), whose sum is σ = 40960040160. Its totient is φ = 15736044960.

The previous prime is 25979172799. The next prime is 25979172841. The reversal of 25979172813 is 31827197952.

It is a happy number.

25979172813 is a `hidden beast` number, since 2 + 597 + 9 + 17 + 28 + 13 = 666.

It is not a de Polignac number, because 25979172813 - 2⁴ = 25979172797 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25979172813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25979172893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103770 + ... + 250452.

It is an arithmetic number, because the mean of its divisors is an integer number (1706668340).

Almost surely, 2^25979172813 is an apocalyptic number.

It is an amenable number.

25979172813 is a deficient number, since it is larger than the sum of its proper divisors (14980867347).

25979172813 is a wasteful number, since it uses less digits than its factorization.

25979172813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148489 (or 148486 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 25979172813 in words is "twenty-five billion, nine hundred seventy-nine million, one hundred seventy-two thousand, eight hundred thirteen".