165001899 has 4 divisors (see below), whose sum is σ = 220002536. Its totient is φ = 110001264.

The previous prime is 165001891. The next prime is 165001901. The reversal of 165001899 is 998100561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998100561 = 3 ⋅332700187.

It is not a de Polignac number, because 165001899 - 2³ = 165001891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165001891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27500314 + ... + 27500319.

It is an arithmetic number, because the mean of its divisors is an integer number (55000634).

Almost surely, 2^165001899 is an apocalyptic number.

165001899 is a deficient number, since it is larger than the sum of its proper divisors (55000637).

165001899 is an equidigital number, since it uses as much as digits as its factorization.

165001899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55000636.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 165001899 is about 12845.3064969272. The cubic root of 165001899 is about 548.4827594064.

The spelling of 165001899 in words is "one hundred sixty-five million, one thousand, eight hundred ninety-nine".