165221333 has 2 divisors, whose sum is σ = 165221334. Its totient is φ = 165221332.

The previous prime is 165221293. The next prime is 165221341. The reversal of 165221333 is 333122561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141181924 + 24039409 = 11882^2 + 4903^2 .

It is an emirp because it is prime and its reverse (333122561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165221333 - 2²⁴ = 148444117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165221363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82610666 + 82610667.

It is an arithmetic number, because the mean of its divisors is an integer number (82610667).

Almost surely, 2^165221333 is an apocalyptic number.

It is an amenable number.

165221333 is a deficient number, since it is larger than the sum of its proper divisors (1).

165221333 is an equidigital number, since it uses as much as digits as its factorization.

165221333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 165221333 is about 12853.8450667495. The cubic root of 165221333 is about 548.7257918659.

Adding to 165221333 its reverse (333122561), we get a palindrome (498343894).

The spelling of 165221333 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred thirty-three".