331666646 has 8 divisors (see below), whose sum is σ = 499635864. Its totient is φ = 165121360.

The previous prime is 331666627. The next prime is 331666663. The reversal of 331666646 is 646666133.

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

It is a super-2 number, since 2×331666646² = 220005528137778632, which contains 22 as substring.

It is a congruent number.

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, 355400 + ... + 356331.

It is an arithmetic number, because the mean of its divisors is an integer number (62454483).

Almost surely, 2^331666646 is an apocalyptic number.

331666646 is a deficient number, since it is larger than the sum of its proper divisors (167969218).

331666646 is a wasteful number, since it uses less digits than its factorization.

331666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711966.

The product of its digits is 279936, while the sum is 41.

The square root of 331666646 is about 18211.7172721301. The cubic root of 331666646 is about 692.2037264778.

The spelling of 331666646 in words is "three hundred thirty-one million, six hundred sixty-six thousand, six hundred forty-six".