161166361 has 4 divisors (see below), whose sum is σ = 161201152. Its totient is φ = 161131572.

The previous prime is 161166349. The next prime is 161166403. The reversal of 161166361 is 163661161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163661161 = 607 ⋅269623.

It is a cyclic number.

It is not a de Polignac number, because 161166361 - 2⁷ = 161166233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161166301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9141 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (40300288).

Almost surely, 2^161166361 is an apocalyptic number.

It is an amenable number.

161166361 is a deficient number, since it is larger than the sum of its proper divisors (34791).

161166361 is an equidigital number, since it uses as much as digits as its factorization.

161166361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34790.

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

The square root of 161166361 is about 12695.1313896312. The cubic root of 161166361 is about 544.1994936317.

The spelling of 161166361 in words is "one hundred sixty-one million, one hundred sixty-six thousand, three hundred sixty-one".