166401073 has 2 divisors, whose sum is σ = 166401074. Its totient is φ = 166401072.

The previous prime is 166401029. The next prime is 166401089. The reversal of 166401073 is 370104661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137757169 + 28643904 = 11737^2 + 5352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166401073 is a prime.

It is not a weakly prime, because it can be changed into another prime (166401673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83200536 + 83200537.

It is an arithmetic number, because the mean of its divisors is an integer number (83200537).

Almost surely, 2^166401073 is an apocalyptic number.

It is an amenable number.

166401073 is a deficient number, since it is larger than the sum of its proper divisors (1).

166401073 is an equidigital number, since it uses as much as digits as its factorization.

166401073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 166401073 is about 12899.6539876076. The cubic root of 166401073 is about 550.0287290778.

The spelling of 166401073 in words is "one hundred sixty-six million, four hundred one thousand, seventy-three".