166161361 has 4 divisors (see below), whose sum is σ = 173385792. Its totient is φ = 158936932.

The previous prime is 166161341. The next prime is 166161367. The reversal of 166161361 is 163161661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166161361 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166161367) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3612181 + ... + 3612226.

It is an arithmetic number, because the mean of its divisors is an integer number (43346448).

Almost surely, 2^166161361 is an apocalyptic number.

It is an amenable number.

166161361 is a deficient number, since it is larger than the sum of its proper divisors (7224431).

166161361 is an equidigital number, since it uses as much as digits as its factorization.

166161361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7224430.

The product of its digits is 3888, while the sum is 31.

The square root of 166161361 is about 12890.3592269572. The cubic root of 166161361 is about 549.7644842881.

The spelling of 166161361 in words is "one hundred sixty-six million, one hundred sixty-one thousand, three hundred sixty-one".