26172236864 has 28 divisors (see below), whose sum is σ = 51944575308. Its totient is φ = 13083840000.

The previous prime is 26172236863. The next prime is 26172236887. The reversal of 26172236864 is 46863227162.

It can be written as a sum of positive squares in 2 ways, for example, as 19546276864 + 6625960000 = 139808^2 + 81400^2 .

It is not an unprimeable number, because it can be changed into a prime (26172236863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370814 + ... + 435714.

Almost surely, 2^26172236864 is an apocalyptic number.

It is an amenable number.

26172236864 is a deficient number, since it is larger than the sum of its proper divisors (25772338444).

26172236864 is an equidigital number, since it uses as much as digits as its factorization.

26172236864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71214 (or 71204 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The spelling of 26172236864 in words is "twenty-six billion, one hundred seventy-two million, two hundred thirty-six thousand, eight hundred sixty-four".