166321369 has 2 divisors, whose sum is σ = 166321370. Its totient is φ = 166321368.

The previous prime is 166321361. The next prime is 166321381. The reversal of 166321369 is 963123661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151782400 + 14538969 = 12320^2 + 3813^2 .

It is a cyclic number.

It is not a de Polignac number, because 166321369 - 2³ = 166321361 is a prime.

It is a super-2 number, since 2×166321369² = 55325595572068322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166321361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83160684 + 83160685.

It is an arithmetic number, because the mean of its divisors is an integer number (83160685).

Almost surely, 2^166321369 is an apocalyptic number.

It is an amenable number.

166321369 is a deficient number, since it is larger than the sum of its proper divisors (1).

166321369 is an equidigital number, since it uses as much as digits as its factorization.

166321369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 166321369 is about 12896.5642323838. The cubic root of 166321369 is about 549.9408961282.

It can be divided in two parts, 1663 and 21369, that added together give a palindrome (23032).

The spelling of 166321369 in words is "one hundred sixty-six million, three hundred twenty-one thousand, three hundred sixty-nine".