166246321 has 2 divisors, whose sum is σ = 166246322. Its totient is φ = 166246320.

The previous prime is 166246309. The next prime is 166246337. The reversal of 166246321 is 123642661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 20802721 = 12060^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 166246321 - 2⁷ = 166246193 is a prime.

It is not a weakly prime, because it can be changed into another prime (166246121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83123160 + 83123161.

It is an arithmetic number, because the mean of its divisors is an integer number (83123161).

Almost surely, 2^166246321 is an apocalyptic number.

It is an amenable number.

166246321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166246321 is an equidigital number, since it uses as much as digits as its factorization.

166246321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 166246321 is about 12893.6542919376. The cubic root of 166246321 is about 549.8581683869.

Adding to 166246321 its reverse (123642661), we get a palindrome (289888982).

The spelling of 166246321 in words is "one hundred sixty-six million, two hundred forty-six thousand, three hundred twenty-one".