26313164721 has 12 divisors (see below), whose sum is σ = 38028352180. Its totient is φ = 17532672480.

The previous prime is 26313164711. The next prime is 26313164741. The reversal of 26313164721 is 12746131362.

26313164721 is a `hidden beast` number, since 2 + 6 + 3 + 1 + 3 + 1 + 647 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6905610000 + 19407554721 = 83100^2 + 139311^2 .

It is not a de Polignac number, because 26313164721 - 2⁷ = 26313164593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26313164701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 768766 + ... + 802263.

Almost surely, 2^26313164721 is an apocalyptic number.

It is an amenable number.

26313164721 is a deficient number, since it is larger than the sum of its proper divisors (11715187459).

26313164721 is a wasteful number, since it uses less digits than its factorization.

26313164721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572896 (or 1572893 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

It can be divided in two parts, 26313164 and 721, that added together give a triangular number (26313885 = T₇₂₅₄).

The spelling of 26313164721 in words is "twenty-six billion, three hundred thirteen million, one hundred sixty-four thousand, seven hundred twenty-one".