165561443 has 8 divisors (see below), whose sum is σ = 167535312. Its totient is φ = 163593216.

The previous prime is 165561397. The next prime is 165561467. The reversal of 165561443 is 344165561.

165561443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 165561443 - 2⁶ = 165561379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165561043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93896 + ... + 95642.

It is an arithmetic number, because the mean of its divisors is an integer number (20941914).

Almost surely, 2^165561443 is an apocalyptic number.

165561443 is a deficient number, since it is larger than the sum of its proper divisors (1973869).

165561443 is an equidigital number, since it uses as much as digits as its factorization.

165561443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821.

The product of its digits is 43200, while the sum is 35.

The square root of 165561443 is about 12867.0681586755. The cubic root of 165561443 is about 549.1020532399.

The spelling of 165561443 in words is "one hundred sixty-five million, five hundred sixty-one thousand, four hundred forty-three".