165113819 has 24 divisors (see below), whose sum is σ = 189719712. Its totient is φ = 142819200.

The previous prime is 165113789. The next prime is 165113821. The reversal of 165113819 is 918311561.

It is a happy number.

It is not a de Polignac number, because 165113819 - 2⁸ = 165113563 is a prime.

It is a super-2 number, since 2×165113819² = 54525146449529522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165113899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 708527 + ... + 708759.

It is an arithmetic number, because the mean of its divisors is an integer number (7904988).

Almost surely, 2^165113819 is an apocalyptic number.

165113819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

165113819 is a deficient number, since it is larger than the sum of its proper divisors (24605893).

165113819 is a wasteful number, since it uses less digits than its factorization.

165113819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 416 counting only the distinct ones).

The product of its digits is 6480, while the sum is 35.

The square root of 165113819 is about 12849.6622134592. The cubic root of 165113819 is about 548.6067424570.

The spelling of 165113819 in words is "one hundred sixty-five million, one hundred thirteen thousand, eight hundred nineteen".