26402705664 has 72 divisors (see below), whose sum is σ = 70310345952. Its totient is φ = 8795811840.

The previous prime is 26402705657. The next prime is 26402705669. The reversal of 26402705664 is 46650720462.

It is not an unprimeable number, because it can be changed into a prime (26402705669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460199 + ... + 1478169.

Almost surely, 2^26402705664 is an apocalyptic number.

26402705664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26402705664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35155172976).

26402705664 is an abundant number, since it is smaller than the sum of its proper divisors (43907640288).

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

26402705664 is a wasteful number, since it uses less digits than its factorization.

26402705664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19903 (or 19889 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 26402705664 in words is "twenty-six billion, four hundred two million, seven hundred five thousand, six hundred sixty-four".