6642443560 has 16 divisors (see below), whose sum is σ = 14945498100. Its totient is φ = 2656977408.

The previous prime is 6642443543. The next prime is 6642443593. The reversal of 6642443560 is 653442466.

It can be written as a sum of positive squares in 2 ways, for example, as 6590517124 + 51926436 = 81182^2 + 7206^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 166061089 = 6642443560 / (6 + 6 + 4 + 2 + 4 + 4 + 3 + 5 + 6 + 0).

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, 83030505 + ... + 83030584.

Almost surely, 2^6642443560 is an apocalyptic number.

It is an amenable number.

6642443560 is an abundant number, since it is smaller than the sum of its proper divisors (8303054540).

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

6642443560 is a wasteful number, since it uses less digits than its factorization.

6642443560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166061100 (or 166061096 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 40.

The square root of 6642443560 is about 81501.1874760117. The cubic root of 6642443560 is about 1879.7898097588.

The spelling of 6642443560 in words is "six billion, six hundred forty-two million, four hundred forty-three thousand, five hundred sixty".