165345247 has 4 divisors (see below), whose sum is σ = 175071456. Its totient is φ = 155619040.

The previous prime is 165345233. The next prime is 165345293. The reversal of 165345247 is 742543561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742543561 = 17 ⋅43679033.

It is a cyclic number.

It is not a de Polignac number, because 165345247 - 2¹⁵ = 165312479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165345217) 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, 4863079 + ... + 4863112.

It is an arithmetic number, because the mean of its divisors is an integer number (43767864).

Almost surely, 2^165345247 is an apocalyptic number.

165345247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

165345247 is a deficient number, since it is larger than the sum of its proper divisors (9726209).

165345247 is an equidigital number, since it uses as much as digits as its factorization.

165345247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9726208.

The product of its digits is 100800, while the sum is 37.

The square root of 165345247 is about 12858.6642774434. The cubic root of 165345247 is about 548.8629368201.

The spelling of 165345247 in words is "one hundred sixty-five million, three hundred forty-five thousand, two hundred forty-seven".