166049321 has 2 divisors, whose sum is σ = 166049322. Its totient is φ = 166049320.

The previous prime is 166049311. The next prime is 166049339. The reversal of 166049321 is 123940661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132825625 + 33223696 = 11525^2 + 5764^2 .

It is a cyclic number.

It is not a de Polignac number, because 166049321 - 2¹⁸ = 165787177 is a prime.

It is a super-2 number, since 2×166049321² = 55144754009122082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166049311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83024660 + 83024661.

It is an arithmetic number, because the mean of its divisors is an integer number (83024661).

Almost surely, 2^166049321 is an apocalyptic number.

It is an amenable number.

166049321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166049321 is an equidigital number, since it uses as much as digits as its factorization.

166049321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 166049321 is about 12886.0126105790. The cubic root of 166049321 is about 549.6408906480.

Adding to 166049321 its reverse (123940661), we get a palindrome (289989982).

The spelling of 166049321 in words is "one hundred sixty-six million, forty-nine thousand, three hundred twenty-one".