6642508880 has 120 divisors (see below), whose sum is σ = 18239296896. Its totient is φ = 2203787520.

The previous prime is 6642508853. The next prime is 6642508891. The reversal of 6642508880 is 888052466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531989 + ... + 544331.

Almost surely, 2^6642508880 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 6642508880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9119648448).

6642508880 is an abundant number, since it is smaller than the sum of its proper divisors (11596788016).

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

6642508880 is a wasteful number, since it uses less digits than its factorization.

6642508880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12425 (or 12388 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 47.

The square root of 6642508880 is about 81501.5882053841. The cubic root of 6642508880 is about 1879.7959715207.

The spelling of 6642508880 in words is "six billion, six hundred forty-two million, five hundred eight thousand, eight hundred eighty".