26138172535965 has 64 divisors (see below), whose sum is σ = 53106779013120. Its totient is φ = 11948732470080.

The previous prime is 26138172535931. The next prime is 26138172536009. The reversal of 26138172535965 is 56953527183162.

26138172535965 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 8 + 1 + 7 + 2 + 535 + 96 + 5 = 666.

It is not a de Polignac number, because 26138172535965 - 2⁶ = 26138172535901 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129355542 + ... + 129557448.

It is an arithmetic number, because the mean of its divisors is an integer number (829793422080).

Almost surely, 2^{26138172535965} is an apocalyptic number.

It is an amenable number.

26138172535965 is an abundant number, since it is smaller than the sum of its proper divisors (26968606477155).

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

26138172535965 is a wasteful number, since it uses less digits than its factorization.

26138172535965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338919 (or 338913 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 63.

The spelling of 26138172535965 in words is "twenty-six trillion, one hundred thirty-eight billion, one hundred seventy-two million, five hundred thirty-five thousand, nine hundred sixty-five".