166066477 has 2 divisors, whose sum is σ = 166066478. Its totient is φ = 166066476.

The previous prime is 166066457. The next prime is 166066493. The reversal of 166066477 is 774660661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85174441 + 80892036 = 9229^2 + 8994^2 .

It is a cyclic number.

It is not a de Polignac number, because 166066477 - 2¹⁵ = 166033709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166066427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83033238 + 83033239.

It is an arithmetic number, because the mean of its divisors is an integer number (83033239).

Almost surely, 2^166066477 is an apocalyptic number.

It is an amenable number.

166066477 is a deficient number, since it is larger than the sum of its proper divisors (1).

166066477 is an equidigital number, since it uses as much as digits as its factorization.

166066477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 166066477 is about 12886.6782764217. The cubic root of 166066477 is about 549.6598193903.

The spelling of 166066477 in words is "one hundred sixty-six million, sixty-six thousand, four hundred seventy-seven".