26164785664 has 120 divisors (see below), whose sum is σ = 55379478924. Its totient is φ = 12342067200.

The previous prime is 26164785607. The next prime is 26164785683. The reversal of 26164785664 is 46658746162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25985440000 + 179345664 = 161200^2 + 13392^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20172664 + ... + 20173960.

Almost surely, 2^26164785664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26164785664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27689739462).

26164785664 is an abundant number, since it is smaller than the sum of its proper divisors (29214693260).

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

26164785664 is an equidigital number, since it uses as much as digits as its factorization.

26164785664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1371 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 55.

The spelling of 26164785664 in words is "twenty-six billion, one hundred sixty-four million, seven hundred eighty-five thousand, six hundred sixty-four".