26663906790 has 96 divisors (see below), whose sum is σ = 71070120576. Its totient is φ = 6931768320.

The previous prime is 26663906741. The next prime is 26663906807. The reversal of 26663906790 is 9760936662.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9027954 + ... + 9030906.

It is an arithmetic number, because the mean of its divisors is an integer number (740313756).

Almost surely, 2^26663906790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26663906790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35535060288).

26663906790 is an abundant number, since it is smaller than the sum of its proper divisors (44406213786).

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

26663906790 is a wasteful number, since it uses less digits than its factorization.

26663906790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The spelling of 26663906790 in words is "twenty-six billion, six hundred sixty-three million, nine hundred six thousand, seven hundred ninety".