161155165 has 16 divisors (see below), whose sum is σ = 201350448. Its totient is φ = 123710976.

The previous prime is 161155157. The next prime is 161155171. The reversal of 161155165 is 561551161.

It can be written as a sum of positive squares in 8 ways, for example, as 22221796 + 138933369 = 4714^2 + 11787^2 .

It is a cyclic number.

It is not a de Polignac number, because 161155165 - 2³ = 161155157 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7539 + ... + 19471.

It is an arithmetic number, because the mean of its divisors is an integer number (12584403).

Almost surely, 2^161155165 is an apocalyptic number.

It is an amenable number.

161155165 is a deficient number, since it is larger than the sum of its proper divisors (40195283).

161155165 is a wasteful number, since it uses less digits than its factorization.

161155165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12048.

The product of its digits is 4500, while the sum is 31.

The square root of 161155165 is about 12694.6904255283. The cubic root of 161155165 is about 544.1868917492.

The spelling of 161155165 in words is "one hundred sixty-one million, one hundred fifty-five thousand, one hundred sixty-five".