165663361 has 4 divisors (see below), whose sum is σ = 165710272. Its totient is φ = 165616452.

The previous prime is 165663359. The next prime is 165663367. The reversal of 165663361 is 163366561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165663361 - 2¹ = 165663359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165663361.

It is not an unprimeable number, because it can be changed into a prime (165663367) 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, 17685 + ... + 25378.

It is an arithmetic number, because the mean of its divisors is an integer number (41427568).

Almost surely, 2^165663361 is an apocalyptic number.

It is an amenable number.

165663361 is a deficient number, since it is larger than the sum of its proper divisors (46911).

165663361 is an equidigital number, since it uses as much as digits as its factorization.

165663361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46910.

The product of its digits is 58320, while the sum is 37.

The square root of 165663361 is about 12871.0279698243. The cubic root of 165663361 is about 549.2147040730.

The spelling of 165663361 in words is "one hundred sixty-five million, six hundred sixty-three thousand, three hundred sixty-one".