6642442644 has 12 divisors (see below), whose sum is σ = 15499032864. Its totient is φ = 2214147544.

The previous prime is 6642442637. The next prime is 6642442753. The reversal of 6642442644 is 4462442466.

It is a tau number, because it is divible by the number of its divisors (12).

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

It is a junction number, because it is equal to n+sod(n) for n = 6642442596 and 6642442605.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 276768432 + ... + 276768455.

It is an arithmetic number, because the mean of its divisors is an integer number (1291586072).

Almost surely, 2^6642442644 is an apocalyptic number.

It is an amenable number.

6642442644 is an abundant number, since it is smaller than the sum of its proper divisors (8856590220).

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

6642442644 is a wasteful number, since it uses less digits than its factorization.

6642442644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553536894 (or 553536892 counting only the distinct ones).

The product of its digits is 884736, while the sum is 42.

The square root of 6642442644 is about 81501.1818564614. The cubic root of 6642442644 is about 1879.7897233505.

The spelling of 6642442644 in words is "six billion, six hundred forty-two million, four hundred forty-two thousand, six hundred forty-four".