26256317568 has 128 divisors (see below), whose sum is σ = 75525777600. Its totient is φ = 8033955840.

The previous prime is 26256317557. The next prime is 26256317587. The reversal of 26256317568 is 86571365262.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 26256317568.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889023 + ... + 918081.

Almost surely, 2^26256317568 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 26256317568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37762888800).

26256317568 is an abundant number, since it is smaller than the sum of its proper divisors (49269460032).

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

26256317568 is a wasteful number, since it uses less digits than its factorization.

26256317568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29270 (or 29258 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 51.

The spelling of 26256317568 in words is "twenty-six billion, two hundred fifty-six million, three hundred seventeen thousand, five hundred sixty-eight".