165021343 has 4 divisors (see below), whose sum is σ = 172196208. Its totient is φ = 157846480.

The previous prime is 165021341. The next prime is 165021359. The reversal of 165021343 is 343120561.

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 165021343 - 2¹ = 165021341 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 (165021341) 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, 3587398 + ... + 3587443.

It is an arithmetic number, because the mean of its divisors is an integer number (43049052).

Almost surely, 2^165021343 is an apocalyptic number.

165021343 is a deficient number, since it is larger than the sum of its proper divisors (7174865).

165021343 is an equidigital number, since it uses as much as digits as its factorization.

165021343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174864.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 165021343 is about 12846.0633269496. The cubic root of 165021343 is about 548.5043031583.

The spelling of 165021343 in words is "one hundred sixty-five million, twenty-one thousand, three hundred forty-three".