165143111 has 8 divisors (see below), whose sum is σ = 188818464. Its totient is φ = 141488640.

The previous prime is 165143087. The next prime is 165143123. The reversal of 165143111 is 111341561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165143111 - 2²⁶ = 98034247 is a prime.

It is a super-2 number, since 2×165143111² = 54544494221516642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165140111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19631 + ... + 26751.

It is an arithmetic number, because the mean of its divisors is an integer number (23602308).

Almost surely, 2^165143111 is an apocalyptic number.

165143111 is a deficient number, since it is larger than the sum of its proper divisors (23675353).

165143111 is an equidigital number, since it uses as much as digits as its factorization.

165143111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10441.

The product of its digits is 360, while the sum is 23.

The square root of 165143111 is about 12850.8019594109. The cubic root of 165143111 is about 548.6391823795.

Adding to 165143111 its reverse (111341561), we get a palindrome (276484672).

The spelling of 165143111 in words is "one hundred sixty-five million, one hundred forty-three thousand, one hundred eleven".