166320801 has 6 divisors (see below), whose sum is σ = 240241170. Its totient is φ = 110880528.

The previous prime is 166320779. The next prime is 166320853. The reversal of 166320801 is 108023661.

It can be written as a sum of positive squares in only one way, i.e., 143424576 + 22896225 = 11976^2 + 4785^2 .

It is not a de Polignac number, because 166320801 - 2⁵ = 166320769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166320601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9240036 + ... + 9240053.

It is an arithmetic number, because the mean of its divisors is an integer number (40040195).

Almost surely, 2^166320801 is an apocalyptic number.

It is an amenable number.

166320801 is a deficient number, since it is larger than the sum of its proper divisors (73920369).

166320801 is a wasteful number, since it uses less digits than its factorization.

166320801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480095 (or 18480092 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 166320801 is about 12896.5422109959. The cubic root of 166320801 is about 549.9402700976.

The spelling of 166320801 in words is "one hundred sixty-six million, three hundred twenty thousand, eight hundred one".