161161065 has 24 divisors (see below), whose sum is σ = 300835080. Its totient is φ = 79340544.

The previous prime is 161161061. The next prime is 161161067. The reversal of 161161065 is 560161161.

It can be written as a sum of positive squares in 4 ways, for example, as 1871424 + 159289641 = 1368^2 + 12621^2 .

It is not a de Polignac number, because 161161065 - 2² = 161161061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161161061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137160 + ... + 138329.

It is an arithmetic number, because the mean of its divisors is an integer number (12534795).

Almost surely, 2^161161065 is an apocalyptic number.

161161065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161161065 is a deficient number, since it is larger than the sum of its proper divisors (139674015).

161161065 is a wasteful number, since it uses less digits than its factorization.

161161065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275513 (or 275510 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161161065 is about 12694.9228040189. The cubic root of 161161065 is about 544.1935326854.

The spelling of 161161065 in words is "one hundred sixty-one million, one hundred sixty-one thousand, sixty-five".