320959966 has 16 divisors (see below), whose sum is σ = 510766560. Its totient is φ = 150741760.

The previous prime is 320959943. The next prime is 320959981. The reversal of 320959966 is 669959023.

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, 8655 + ... + 26773.

It is an arithmetic number, because the mean of its divisors is an integer number (31922910).

Almost surely, 2^320959966 is an apocalyptic number.

320959966 is a deficient number, since it is larger than the sum of its proper divisors (189806594).

320959966 is a wasteful number, since it uses less digits than its factorization.

320959966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18659.

The product of its (nonzero) digits is 787320, while the sum is 49.

The square root of 320959966 is about 17915.3555923403. The cubic root of 320959966 is about 684.6736620203.

The spelling of 320959966 in words is "three hundred twenty million, nine hundred fifty-nine thousand, nine hundred sixty-six".