26655556680 has 128 divisors (see below), whose sum is σ = 88925731200. Its totient is φ = 7102238976.

The previous prime is 26655556651. The next prime is 26655556721. The reversal of 26655556680 is 8665555662.

26655556680 is a `hidden beast` number, since 2 + 6 + 6 + 5 + 5 + 556 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1376022 + ... + 1395258.

It is an arithmetic number, because the mean of its divisors is an integer number (694732275).

Almost surely, 2^26655556680 is an apocalyptic number.

26655556680 is a gapful number since it is divisible by the number (20) 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 26655556680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44462865600).

26655556680 is an abundant number, since it is smaller than the sum of its proper divisors (62270174520).

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

26655556680 is a wasteful number, since it uses less digits than its factorization.

26655556680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20540 (or 20530 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 26655556680 in words is "twenty-six billion, six hundred fifty-five million, five hundred fifty-six thousand, six hundred eighty".