6642379944 has 128 divisors (see below), whose sum is σ = 20386080000. Its totient is φ = 1993254912.

The previous prime is 6642379943. The next prime is 6642379969. The reversal of 6642379944 is 4499732466.

6642379944 is a `hidden beast` number, since 66 + 423 + 79 + 94 + 4 = 666.

It is a super-2 number, since 2×6642379944² = 88242422640906886272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (6642379943) 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 31 ways as a sum of consecutive naturals, for example, 45132 + ... + 123780.

It is an arithmetic number, because the mean of its divisors is an integer number (159266250).

Almost surely, 2^6642379944 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 6642379944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10193040000).

6642379944 is an abundant number, since it is smaller than the sum of its proper divisors (13743700056).

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

6642379944 is a wasteful number, since it uses less digits than its factorization.

6642379944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78704 (or 78694 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

The square root of 6642379944 is about 81500.7971985551. The cubic root of 6642379944 is about 1879.7838086996.

The spelling of 6642379944 in words is "six billion, six hundred forty-two million, three hundred seventy-nine thousand, nine hundred forty-four".