165983243 has 4 divisors (see below), whose sum is σ = 166389480. Its totient is φ = 165577008.

The previous prime is 165983219. The next prime is 165983261. The reversal of 165983243 is 342389561.

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 165983243 - 2¹² = 165979147 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 165983243.

It is not an unprimeable number, because it can be changed into a prime (165983263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202505 + ... + 203322.

It is an arithmetic number, because the mean of its divisors is an integer number (41597370).

Almost surely, 2^165983243 is an apocalyptic number.

165983243 is a deficient number, since it is larger than the sum of its proper divisors (406237).

165983243 is an equidigital number, since it uses as much as digits as its factorization.

165983243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406236.

The product of its digits is 155520, while the sum is 41.

The square root of 165983243 is about 12883.4484125951. The cubic root of 165983243 is about 549.5679725751.

The spelling of 165983243 in words is "one hundred sixty-five million, nine hundred eighty-three thousand, two hundred forty-three".