26017721664 has 448 divisors, whose sum is σ = 81742970880. Its totient is φ = 7225344000.

The previous prime is 26017721627. The next prime is 26017721669. The reversal of 26017721664 is 46612771062.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26017721669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134806752 + ... + 134806944.

Almost surely, 2^26017721664 is an apocalyptic number.

26017721664 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 26017721664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40871485440).

26017721664 is an abundant number, since it is smaller than the sum of its proper divisors (55725249216).

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

26017721664 is a wasteful number, since it uses less digits than its factorization.

26017721664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 26017721664 in words is "twenty-six billion, seventeen million, seven hundred twenty-one thousand, six hundred sixty-four".