166116161 has 4 divisors (see below), whose sum is σ = 166435524. Its totient is φ = 165796800.

The previous prime is 166116149. The next prime is 166116173. The reversal of 166116161 is 161611661.

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

It is an interprime number because it is at equal distance from previous prime (166116149) and next prime (166116173).

It can be written as a sum of positive squares in 2 ways, for example, as 99121936 + 66994225 = 9956^2 + 8185^2 .

It is a cyclic number.

It is not a de Polignac number, because 166116161 - 2¹⁰ = 166115137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166116131) 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, 158900 + ... + 159941.

It is an arithmetic number, because the mean of its divisors is an integer number (41608881).

Almost surely, 2^166116161 is an apocalyptic number.

It is an amenable number.

166116161 is a deficient number, since it is larger than the sum of its proper divisors (319363).

166116161 is an equidigital number, since it uses as much as digits as its factorization.

166116161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319362.

The product of its digits is 1296, while the sum is 29.

The square root of 166116161 is about 12888.6058594403. The cubic root of 166116161 is about 549.7146299214.

The spelling of 166116161 in words is "one hundred sixty-six million, one hundred sixteen thousand, one hundred sixty-one".