165263213 has 4 divisors (see below), whose sum is σ = 167972508. Its totient is φ = 162553920.

The previous prime is 165263207. The next prime is 165263249. The reversal of 165263213 is 312362561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312362561 = 7 ⋅44623223.

It can be written as a sum of positive squares in 2 ways, for example, as 54213769 + 111049444 = 7363^2 + 10538^2 .

It is a cyclic number.

It is not a de Polignac number, because 165263213 - 2¹⁰ = 165262189 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165263513) 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, 1354556 + ... + 1354677.

It is an arithmetic number, because the mean of its divisors is an integer number (41993127).

Almost surely, 2^165263213 is an apocalyptic number.

It is an amenable number.

165263213 is a deficient number, since it is larger than the sum of its proper divisors (2709295).

165263213 is an equidigital number, since it uses as much as digits as its factorization.

165263213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709294.

The product of its digits is 6480, while the sum is 29.

The square root of 165263213 is about 12855.4740480466. The cubic root of 165263213 is about 548.7721512843.

The spelling of 165263213 in words is "one hundred sixty-five million, two hundred sixty-three thousand, two hundred thirteen".