165703633 has 4 divisors (see below), whose sum is σ = 168420148. Its totient is φ = 162987120.

The previous prime is 165703627. The next prime is 165703667. The reversal of 165703633 is 336307561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 336307561 = 31 ⋅10848631.

It can be written as a sum of positive squares in 2 ways, for example, as 91623184 + 74080449 = 9572^2 + 8607^2 .

It is not a de Polignac number, because 165703633 - 2¹³ = 165695441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165703333) 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, 1358166 + ... + 1358287.

It is an arithmetic number, because the mean of its divisors is an integer number (42105037).

Almost surely, 2^165703633 is an apocalyptic number.

It is an amenable number.

165703633 is a deficient number, since it is larger than the sum of its proper divisors (2716515).

165703633 is an equidigital number, since it uses as much as digits as its factorization.

165703633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716514.

The product of its (nonzero) digits is 34020, while the sum is 34.

The square root of 165703633 is about 12872.5923185658. The cubic root of 165703633 is about 549.2592043223.

The spelling of 165703633 in words is "one hundred sixty-five million, seven hundred three thousand, six hundred thirty-three".