165622013 has 2 divisors, whose sum is σ = 165622014. Its totient is φ = 165622012.

The previous prime is 165621997. The next prime is 165622063. The reversal of 165622013 is 310226561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165431044 + 190969 = 12862^2 + 437^2 .

It is an emirp because it is prime and its reverse (310226561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165622013 - 2⁴ = 165621997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165622063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82811006 + 82811007.

It is an arithmetic number, because the mean of its divisors is an integer number (82811007).

Almost surely, 2^165622013 is an apocalyptic number.

It is an amenable number.

165622013 is a deficient number, since it is larger than the sum of its proper divisors (1).

165622013 is an equidigital number, since it uses as much as digits as its factorization.

165622013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 165622013 is about 12869.4216264757. The cubic root of 165622013 is about 549.1690073480.

Adding to 165622013 its reverse (310226561), we get a palindrome (475848574).

The spelling of 165622013 in words is "one hundred sixty-five million, six hundred twenty-two thousand, thirteen".