6644220042 has 16 divisors (see below), whose sum is σ = 13306930560. Its totient is φ = 2211658272.

The previous prime is 6644219999. The next prime is 6644220053. The reversal of 6644220042 is 2400224466.

It is a junction number, because it is equal to n+sod(n) for n = 6644219991 and 6644220009.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765763 + ... + 774390.

It is an arithmetic number, because the mean of its divisors is an integer number (831683160).

Almost surely, 2^6644220042 is an apocalyptic number.

6644220042 is an abundant number, since it is smaller than the sum of its proper divisors (6662710518).

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

6644220042 is a wasteful number, since it uses less digits than its factorization.

6644220042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540877.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 6644220042 is about 81512.0852512068. The cubic root of 6644220042 is about 1879.9573743542.

The spelling of 6644220042 in words is "six billion, six hundred forty-four million, two hundred twenty thousand, forty-two".