5639443666 has 8 divisors (see below), whose sum is σ = 8469396720. Its totient is φ = 2816311428.

The previous prime is 5639443627. The next prime is 5639443673. The reversal of 5639443666 is 6663449365.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703136 + ... + 1706443.

It is an arithmetic number, because the mean of its divisors is an integer number (1058674590).

Almost surely, 2^5639443666 is an apocalyptic number.

5639443666 is a deficient number, since it is larger than the sum of its proper divisors (2829953054).

5639443666 is a wasteful number, since it uses less digits than its factorization.

5639443666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410408.

The product of its digits is 8398080, while the sum is 52.

The square root of 5639443666 is about 75096.2293727188. The cubic root of 5639443666 is about 1779.9675609541.

The spelling of 5639443666 in words is "five billion, six hundred thirty-nine million, four hundred forty-three thousand, six hundred sixty-six".