6642681376 has 24 divisors (see below), whose sum is σ = 13292172684. Its totient is φ = 3266891520.

The previous prime is 6642681343. The next prime is 6642681389. The reversal of 6642681376 is 6731862466.

It can be written as a sum of positive squares in 2 ways, for example, as 6253013776 + 389667600 = 79076^2 + 19740^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699555 + ... + 1703458.

Almost surely, 2^6642681376 is an apocalyptic number.

It is an amenable number.

6642681376 is an abundant number, since it is smaller than the sum of its proper divisors (6649491308).

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

6642681376 is a wasteful number, since it uses less digits than its factorization.

6642681376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403084 (or 3403076 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 6642681376 is about 81502.6464355606. The cubic root of 6642681376 is about 1879.8122432079.

The spelling of 6642681376 in words is "six billion, six hundred forty-two million, six hundred eighty-one thousand, three hundred seventy-six".