165563313 has 16 divisors (see below), whose sum is σ = 222929280. Its totient is φ = 109292544.

The previous prime is 165563303. The next prime is 165563327. The reversal of 165563313 is 313365561.

It is not a de Polignac number, because 165563313 - 2⁴ = 165563297 is a prime.

It is a super-2 number, since 2×165563313² = 54822421223071938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165563303) 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, 155220 + ... + 156282.

It is an arithmetic number, because the mean of its divisors is an integer number (13933080).

Almost surely, 2^165563313 is an apocalyptic number.

It is an amenable number.

165563313 is a deficient number, since it is larger than the sum of its proper divisors (57365967).

165563313 is a wasteful number, since it uses less digits than its factorization.

165563313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its digits is 24300, while the sum is 33.

The square root of 165563313 is about 12867.1408245966. The cubic root of 165563313 is about 549.1041205831.

The spelling of 165563313 in words is "one hundred sixty-five million, five hundred sixty-three thousand, three hundred thirteen".