26615312164 has 81 divisors (see below), whose sum is σ = 55675944891. Its totient is φ = 11100181680.

The previous prime is 26615312161. The next prime is 26615312177. The reversal of 26615312164 is 46121351662.

The square root of 26615312164 is 163142.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (26615312161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 98211349 + ... + 98211619.

Almost surely, 2^26615312164 is an apocalyptic number.

26615312164 is the 163142-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26615312164

26615312164 is an abundant number, since it is smaller than the sum of its proper divisors (29060632727).

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

26615312164 is an equidigital number, since it uses as much as digits as its factorization.

26615312164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 323 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The spelling of 26615312164 in words is "twenty-six billion, six hundred fifteen million, three hundred twelve thousand, one hundred sixty-four".