165391873 has 8 divisors (see below), whose sum is σ = 175015296. Its totient is φ = 155971200.

The previous prime is 165391871. The next prime is 165391907. The reversal of 165391873 is 378193561.

165391873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165391873 - 2¹ = 165391871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165391871) 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, 49008 + ... + 52273.

It is an arithmetic number, because the mean of its divisors is an integer number (21876912).

Almost surely, 2^165391873 is an apocalyptic number.

It is an amenable number.

165391873 is a deficient number, since it is larger than the sum of its proper divisors (9623423).

165391873 is a wasteful number, since it uses less digits than its factorization.

165391873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101375.

The product of its digits is 136080, while the sum is 43.

The square root of 165391873 is about 12860.4771684413. The cubic root of 165391873 is about 548.9145235830.

The spelling of 165391873 in words is "one hundred sixty-five million, three hundred ninety-one thousand, eight hundred seventy-three".