165541567 has 4 divisors (see below), whose sum is σ = 169063776. Its totient is φ = 162019360.

The previous prime is 165541553. The next prime is 165541573. The reversal of 165541567 is 765145561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165541567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165541507) 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, 1761034 + ... + 1761127.

It is an arithmetic number, because the mean of its divisors is an integer number (42265944).

Almost surely, 2^165541567 is an apocalyptic number.

165541567 is a deficient number, since it is larger than the sum of its proper divisors (3522209).

165541567 is an equidigital number, since it uses as much as digits as its factorization.

165541567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522208.

The product of its digits is 126000, while the sum is 40.

The square root of 165541567 is about 12866.2957761743. The cubic root of 165541567 is about 549.0800787411.

The spelling of 165541567 in words is "one hundred sixty-five million, five hundred forty-one thousand, five hundred sixty-seven".