331666644 has 24 divisors (see below), whose sum is σ = 798853888. Its totient is φ = 106989120.

The previous prime is 331666627. The next prime is 331666663. The reversal of 331666644 is 446666133.

It is a super-2 number, since 2×331666644² = 220005525484445472, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445417 + ... + 446160.

Almost surely, 2^331666644 is an apocalyptic number.

It is an amenable number.

331666644 is an abundant number, since it is smaller than the sum of its proper divisors (467187244).

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

331666644 is a wasteful number, since it uses less digits than its factorization.

331666644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891615 (or 891613 counting only the distinct ones).

The product of its digits is 186624, while the sum is 39.

The square root of 331666644 is about 18211.7172172203. The cubic root of 331666644 is about 692.2037250865.

The spelling of 331666644 in words is "three hundred thirty-one million, six hundred sixty-six thousand, six hundred forty-four".