320145666 has 32 divisors (see below), whose sum is σ = 678958848. Its totient is φ = 100289280.

The previous prime is 320145653. The next prime is 320145677. The reversal of 320145666 is 666541023.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81831 + ... + 85653.

It is an arithmetic number, because the mean of its divisors is an integer number (21217464).

Almost surely, 2^320145666 is an apocalyptic number.

320145666 is an abundant number, since it is smaller than the sum of its proper divisors (358813182).

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

320145666 is a wasteful number, since it uses less digits than its factorization.

320145666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 320145666 is about 17892.6148452371. The cubic root of 320145666 is about 684.0941484918.

Adding to 320145666 its reverse (666541023), we get a palindrome (986686689).

The spelling of 320145666 in words is "three hundred twenty million, one hundred forty-five thousand, six hundred sixty-six".