6642225644 has 24 divisors (see below), whose sum is σ = 12023976720. Its totient is φ = 3208095936.

The previous prime is 6642225643. The next prime is 6642225647. The reversal of 6642225644 is 4465222466.

It is a happy number.

It is a super-2 number, since 2×6642225644² = 88238323011622429472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6642225643) 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 7 ways as a sum of consecutive naturals, for example, 140867 + ... + 182010.

It is an arithmetic number, because the mean of its divisors is an integer number (500999030).

Almost surely, 2^6642225644 is an apocalyptic number.

It is an amenable number.

6642225644 is a deficient number, since it is larger than the sum of its proper divisors (5381751076).

6642225644 is a wasteful number, since it uses less digits than its factorization.

6642225644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323057 (or 323055 counting only the distinct ones).

The product of its digits is 552960, while the sum is 41.

The square root of 6642225644 is about 81499.8505765501. The cubic root of 6642225644 is about 1879.7692530288.

The spelling of 6642225644 in words is "six billion, six hundred forty-two million, two hundred twenty-five thousand, six hundred forty-four".