165170387 has 4 divisors (see below), whose sum is σ = 170498496. Its totient is φ = 159842280.

The previous prime is 165170381. The next prime is 165170389. The reversal of 165170387 is 783071561.

165170387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165170387 - 2¹² = 165166291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165170387.

It is not an unprimeable number, because it can be changed into a prime (165170381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2664008 + ... + 2664069.

It is an arithmetic number, because the mean of its divisors is an integer number (42624624).

Almost surely, 2^165170387 is an apocalyptic number.

165170387 is a deficient number, since it is larger than the sum of its proper divisors (5328109).

165170387 is an equidigital number, since it uses as much as digits as its factorization.

165170387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328108.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 165170387 is about 12851.8631723186. The cubic root of 165170387 is about 548.6693861998.

The spelling of 165170387 in words is "one hundred sixty-five million, one hundred seventy thousand, three hundred eighty-seven".