165192561 has 16 divisors (see below), whose sum is σ = 245120320. Its totient is φ = 109952640.

The previous prime is 165192557. The next prime is 165192563. The reversal of 165192561 is 165291561.

165192561 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 92 + 561 = 666.

165192561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165192561 - 2² = 165192557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165192563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13626 + ... + 22716.

It is an arithmetic number, because the mean of its divisors is an integer number (15320020).

Almost surely, 2^165192561 is an apocalyptic number.

It is an amenable number.

165192561 is a deficient number, since it is larger than the sum of its proper divisors (79927759).

165192561 is an equidigital number, since it uses as much as digits as its factorization.

165192561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9773 (or 9767 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 165192561 is about 12852.7258198407. The cubic root of 165192561 is about 548.6939379184.

The spelling of 165192561 in words is "one hundred sixty-five million, one hundred ninety-two thousand, five hundred sixty-one".