320666445 has 48 divisors (see below), whose sum is σ = 628834752. Its totient is φ = 155468160.

The previous prime is 320666431. The next prime is 320666471. The reversal of 320666445 is 544666023.

It is not a de Polignac number, because 320666445 - 2⁴ = 320666429 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1369 + ... + 25361.

It is an arithmetic number, because the mean of its divisors is an integer number (13100724).

Almost surely, 2^320666445 is an apocalyptic number.

It is an amenable number.

320666445 is a deficient number, since it is larger than the sum of its proper divisors (308168307).

320666445 is a wasteful number, since it uses less digits than its factorization.

320666445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24024 (or 24012 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 320666445 is about 17907.1618354222. The cubic root of 320666445 is about 684.4648847976.

The spelling of 320666445 in words is "three hundred twenty million, six hundred sixty-six thousand, four hundred forty-five".