165687733 has 4 divisors (see below), whose sum is σ = 174408160. Its totient is φ = 156967308.

The previous prime is 165687713. The next prime is 165687749. The reversal of 165687733 is 337786561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 337786561 = 7 ⋅48255223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165687733 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 (165687713) 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, 4360185 + ... + 4360222.

It is an arithmetic number, because the mean of its divisors is an integer number (43602040).

Almost surely, 2^165687733 is an apocalyptic number.

It is an amenable number.

165687733 is a deficient number, since it is larger than the sum of its proper divisors (8720427).

165687733 is an equidigital number, since it uses as much as digits as its factorization.

165687733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8720426.

The product of its digits is 635040, while the sum is 46.

The square root of 165687733 is about 12871.9747125295. The cubic root of 165687733 is about 549.2416358064.

The spelling of 165687733 in words is "one hundred sixty-five million, six hundred eighty-seven thousand, seven hundred thirty-three".