166323331 has 4 divisors (see below), whose sum is σ = 166709664. Its totient is φ = 165937000.

The previous prime is 166323319. The next prime is 166323337. The reversal of 166323331 is 133323661.

166323331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133323661 = 173 ⋅770657.

It is a cyclic number.

It is not a de Polignac number, because 166323331 - 2¹⁵ = 166290563 is a prime.

It is a super-2 number, since 2×166323331² = 55326900869871122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166323331.

It is not an unprimeable number, because it can be changed into a prime (166323337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192520 + ... + 193381.

It is an arithmetic number, because the mean of its divisors is an integer number (41677416).

Almost surely, 2^166323331 is an apocalyptic number.

166323331 is a deficient number, since it is larger than the sum of its proper divisors (386333).

166323331 is an equidigital number, since it uses as much as digits as its factorization.

166323331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386332.

The product of its digits is 5832, while the sum is 28.

The square root of 166323331 is about 12896.6402989306. The cubic root of 166323331 is about 549.9430585679.

Adding to 166323331 its reverse (133323661), we get a palindrome (299646992).

The spelling of 166323331 in words is "one hundred sixty-six million, three hundred twenty-three thousand, three hundred thirty-one".