6642666432 has 84 divisors (see below), whose sum is σ = 19867869840. Its totient is φ = 2117947392.

The previous prime is 6642666419. The next prime is 6642666439. The reversal of 6642666432 is 2346662466.

It is a super-2 number, since 2×6642666432² = 88250034653639221248, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642666439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237457 + ... + 263952.

It is an arithmetic number, because the mean of its divisors is an integer number (236522260).

Almost surely, 2^6642666432 is an apocalyptic number.

It is an amenable number.

6642666432 is an abundant number, since it is smaller than the sum of its proper divisors (13225203408).

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

6642666432 is a wasteful number, since it uses less digits than its factorization.

6642666432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501450 (or 501437 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 45.

The square root of 6642666432 is about 81502.5547575044. The cubic root of 6642666432 is about 1879.8108335394.

The spelling of 6642666432 in words is "six billion, six hundred forty-two million, six hundred sixty-six thousand, four hundred thirty-two".