161330545 has 8 divisors (see below), whose sum is σ = 198829224. Its totient is φ = 125576064.

The previous prime is 161330483. The next prime is 161330551. The reversal of 161330545 is 545033161.

It can be written as a sum of positive squares in 4 ways, for example, as 53523856 + 107806689 = 7316^2 + 10383^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161330545 - 2¹⁵ = 161297777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435844 + ... + 436213.

It is an arithmetic number, because the mean of its divisors is an integer number (24853653).

Almost surely, 2^161330545 is an apocalyptic number.

It is an amenable number.

161330545 is a deficient number, since it is larger than the sum of its proper divisors (37498679).

161330545 is an equidigital number, since it uses as much as digits as its factorization.

161330545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872099.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 161330545 is about 12701.5961595384. The cubic root of 161330545 is about 544.3842272318.

The spelling of 161330545 in words is "one hundred sixty-one million, three hundred thirty thousand, five hundred forty-five".