6642640632 has 32 divisors (see below), whose sum is σ = 16698361680. Its totient is φ = 2201978880.

The previous prime is 6642640601. The next prime is 6642640637. The reversal of 6642640632 is 2360462466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642640637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760233 + ... + 768920.

Almost surely, 2^6642640632 is an apocalyptic number.

It is an amenable number.

6642640632 is an abundant number, since it is smaller than the sum of its proper divisors (10055721048).

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

6642640632 is a wasteful number, since it uses less digits than its factorization.

6642640632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529343 (or 1529339 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 39.

The square root of 6642640632 is about 81502.3964801036. The cubic root of 6642640632 is about 1879.8083998188.

The spelling of 6642640632 in words is "six billion, six hundred forty-two million, six hundred forty thousand, six hundred thirty-two".