165704207 has 4 divisors (see below), whose sum is σ = 171049536. Its totient is φ = 160358880.

The previous prime is 165704191. The next prime is 165704239. The reversal of 165704207 is 702407561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702407561 = 19 ⋅36968819.

It is a cyclic number.

It is not a de Polignac number, because 165704207 - 2⁴ = 165704191 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 (165704257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2672618 + ... + 2672679.

It is an arithmetic number, because the mean of its divisors is an integer number (42762384).

Almost surely, 2^165704207 is an apocalyptic number.

165704207 is a deficient number, since it is larger than the sum of its proper divisors (5345329).

165704207 is an equidigital number, since it uses as much as digits as its factorization.

165704207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5345328.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 165704207 is about 12872.6146139780. The cubic root of 165704207 is about 549.2598385357.

The spelling of 165704207 in words is "one hundred sixty-five million, seven hundred four thousand, two hundred seven".