163366321 has 2 divisors, whose sum is σ = 163366322. Its totient is φ = 163366320.

The previous prime is 163366289. The next prime is 163366349. The reversal of 163366321 is 123663361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142563600 + 20802721 = 11940^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 163366321 - 2⁵ = 163366289 is a prime.

It is not a weakly prime, because it can be changed into another prime (163366421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81683160 + 81683161.

It is an arithmetic number, because the mean of its divisors is an integer number (81683161).

Almost surely, 2^163366321 is an apocalyptic number.

It is an amenable number.

163366321 is a deficient number, since it is larger than the sum of its proper divisors (1).

163366321 is an equidigital number, since it uses as much as digits as its factorization.

163366321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 31.

The square root of 163366321 is about 12781.4835210941. The cubic root of 163366321 is about 546.6644633975.

The spelling of 163366321 in words is "one hundred sixty-three million, three hundred sixty-six thousand, three hundred twenty-one".