26561872086 has 64 divisors (see below), whose sum is σ = 54685160640. Its totient is φ = 8598159360.

The previous prime is 26561872079. The next prime is 26561872121. The reversal of 26561872086 is 68027816562.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9876630 + ... + 9879318.

It is an arithmetic number, because the mean of its divisors is an integer number (854455635).

Almost surely, 2^26561872086 is an apocalyptic number.

26561872086 is an abundant number, since it is smaller than the sum of its proper divisors (28123288554).

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

26561872086 is a wasteful number, since it uses less digits than its factorization.

26561872086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 26561872086 in words is "twenty-six billion, five hundred sixty-one million, eight hundred seventy-two thousand, eighty-six".