664441983 has 12 divisors (see below), whose sum is σ = 961641720. Its totient is φ = 442088016.

The previous prime is 664441931. The next prime is 664442021. The reversal of 664441983 is 389144466.

It is not a de Polignac number, because 664441983 - 2⁹ = 664441471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664441483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67941 + ... + 77102.

It is an arithmetic number, because the mean of its divisors is an integer number (80136810).

Almost surely, 2^664441983 is an apocalyptic number.

664441983 is a deficient number, since it is larger than the sum of its proper divisors (297199737).

664441983 is a wasteful number, since it uses less digits than its factorization.

664441983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145558 (or 145555 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 664441983 is about 25776.7721602221. The cubic root of 664441983 is about 872.6076617474.

The spelling of 664441983 in words is "six hundred sixty-four million, four hundred forty-one thousand, nine hundred eighty-three".