666144442642 has 16 divisors (see below), whose sum is σ = 1191612419712. Its totient is φ = 273077845920.

The previous prime is 666144442577. The next prime is 666144442661. The reversal of 666144442642 is 246244441666.

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 7 ways as a sum of consecutive naturals, for example, 1034385459 + ... + 1034386102.

It is an arithmetic number, because the mean of its divisors is an integer number (74475776232).

Almost surely, 2^666144442642 is an apocalyptic number.

666144442642 is a deficient number, since it is larger than the sum of its proper divisors (525467977070).

666144442642 is a wasteful number, since it uses less digits than its factorization.

666144442642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068771593.

The product of its digits is 5308416, while the sum is 49.

The spelling of 666144442642 in words is "six hundred sixty-six billion, one hundred forty-four million, four hundred forty-two thousand, six hundred forty-two".