156645161 has 4 divisors (see below), whose sum is σ = 160878852. Its totient is φ = 152411472.

The previous prime is 156645149. The next prime is 156645163. The reversal of 156645161 is 161546651.

156645161 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: 161546651 = 7 ⋅23078093.

It can be written as a sum of positive squares in 2 ways, for example, as 79995136 + 76650025 = 8944^2 + 8755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156645161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156645163) 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, 2116790 + ... + 2116863.

It is an arithmetic number, because the mean of its divisors is an integer number (40219713).

Almost surely, 2^156645161 is an apocalyptic number.

It is an amenable number.

156645161 is a deficient number, since it is larger than the sum of its proper divisors (4233691).

156645161 is an equidigital number, since it uses as much as digits as its factorization.

156645161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233690.

The product of its digits is 21600, while the sum is 35.

The square root of 156645161 is about 12515.7964588755. The cubic root of 156645161 is about 539.0623428428.

The spelling of 156645161 in words is "one hundred fifty-six million, six hundred forty-five thousand, one hundred sixty-one".