26640601664 has 56 divisors (see below), whose sum is σ = 54026214528. Its totient is φ = 13028083200.

The previous prime is 26640601649. The next prime is 26640601697. The reversal of 26640601664 is 46610604662.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8068814 + ... + 8072114.

Almost surely, 2^26640601664 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 26640601664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27013107264).

26640601664 is an abundant number, since it is smaller than the sum of its proper divisors (27385612864).

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

26640601664 is a wasteful number, since it uses less digits than its factorization.

26640601664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6043 (or 6033 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 26640601664 in words is "twenty-six billion, six hundred forty million, six hundred one thousand, six hundred sixty-four".