165663213 has 8 divisors (see below), whose sum is σ = 225052128. Its totient is φ = 108358224.

The previous prime is 165663193. The next prime is 165663217. The reversal of 165663213 is 312366561.

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

It is not a de Polignac number, because 165663213 - 2⁶ = 165663149 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165663217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520795 + ... + 521112.

It is an arithmetic number, because the mean of its divisors is an integer number (28131516).

Almost surely, 2^165663213 is an apocalyptic number.

It is an amenable number.

165663213 is a deficient number, since it is larger than the sum of its proper divisors (59388915).

165663213 is a wasteful number, since it uses less digits than its factorization.

165663213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041963.

The product of its digits is 19440, while the sum is 33.

The square root of 165663213 is about 12871.0222204765. The cubic root of 165663213 is about 549.2145405209.

The spelling of 165663213 in words is "one hundred sixty-five million, six hundred sixty-three thousand, two hundred thirteen".