166583321 has 2 divisors, whose sum is σ = 166583322. Its totient is φ = 166583320.

The previous prime is 166583311. The next prime is 166583353. The reversal of 166583321 is 123385661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89775625 + 76807696 = 9475^2 + 8764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166583321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166583311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83291660 + 83291661.

It is an arithmetic number, because the mean of its divisors is an integer number (83291661).

Almost surely, 2^166583321 is an apocalyptic number.

It is an amenable number.

166583321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166583321 is an equidigital number, since it uses as much as digits as its factorization.

166583321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 166583321 is about 12906.7161199121. The cubic root of 166583321 is about 550.2294590777.

The spelling of 166583321 in words is "one hundred sixty-six million, five hundred eighty-three thousand, three hundred twenty-one".