166233161 has 4 divisors (see below), whose sum is σ = 166959300. Its totient is φ = 165507024.

The previous prime is 166233139. The next prime is 166233163. The reversal of 166233161 is 161332661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89775625 + 76457536 = 9475^2 + 8744^2 .

It is a cyclic number.

It is not a de Polignac number, because 166233161 - 2²² = 162038857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166233163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362726 + ... + 363183.

It is an arithmetic number, because the mean of its divisors is an integer number (41739825).

Almost surely, 2^166233161 is an apocalyptic number.

It is an amenable number.

166233161 is a deficient number, since it is larger than the sum of its proper divisors (726139).

166233161 is an equidigital number, since it uses as much as digits as its factorization.

166233161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726138.

The product of its digits is 3888, while the sum is 29.

The square root of 166233161 is about 12893.1439532800. The cubic root of 166233161 is about 549.8436591446.

The spelling of 166233161 in words is "one hundred sixty-six million, two hundred thirty-three thousand, one hundred sixty-one".