26591340636 has 240 divisors, whose sum is σ = 88548768000. Its totient is φ = 6774077952.

The previous prime is 26591340569. The next prime is 26591340641. The reversal of 26591340636 is 63604319562.

26591340636 is a `hidden beast` number, since 2 + 6 + 5 + 9 + 1 + 3 + 4 + 0 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 26591340591 and 26591340600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 714415 + ... + 750713.

It is an arithmetic number, because the mean of its divisors is an integer number (368953200).

Almost surely, 2^26591340636 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 26591340636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44274384000).

26591340636 is an abundant number, since it is smaller than the sum of its proper divisors (61957427364).

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

26591340636 is a wasteful number, since it uses less digits than its factorization.

26591340636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36358 (or 36347 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 26591340636 in words is "twenty-six billion, five hundred ninety-one million, three hundred forty thousand, six hundred thirty-six".