26521430868 has 144 divisors (see below), whose sum is σ = 70761600000. Its totient is φ = 8363796480.

The previous prime is 26521430867. The next prime is 26521430911. The reversal of 26521430868 is 86803412562.

26521430868 is a `hidden beast` number, since 2 + 6 + 521 + 43 + 0 + 86 + 8 = 666.

It is a super-2 number, since 2×26521430868² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26521430867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21233508 + ... + 21234756.

It is an arithmetic number, because the mean of its divisors is an integer number (491400000).

Almost surely, 2^26521430868 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 26521430868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35380800000).

26521430868 is an abundant number, since it is smaller than the sum of its proper divisors (44240169132).

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

26521430868 is a wasteful number, since it uses less digits than its factorization.

26521430868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 26521430868 in words is "twenty-six billion, five hundred twenty-one million, four hundred thirty thousand, eight hundred sixty-eight".