26661006656 has 112 divisors (see below), whose sum is σ = 54664295040. Its totient is φ = 12897239040.

The previous prime is 26661006649. The next prime is 26661006707. The reversal of 26661006656 is 65660016662.

It is a super-2 number, since 2×26661006656² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 70345475 + ... + 70345853.

Almost surely, 2^26661006656 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 26661006656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27332147520).

26661006656 is an abundant number, since it is smaller than the sum of its proper divisors (28003288384).

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

26661006656 is a wasteful number, since it uses less digits than its factorization.

26661006656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 26661006656 in words is "twenty-six billion, six hundred sixty-one million, six thousand, six hundred fifty-six".