166705477 has 2 divisors, whose sum is σ = 166705478. Its totient is φ = 166705476.

The previous prime is 166705471. The next prime is 166705481. The reversal of 166705477 is 774507661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166255236 + 450241 = 12894^2 + 671^2 .

It is an emirp because it is prime and its reverse (774507661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166705477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166705471) 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, 83352738 + 83352739.

It is an arithmetic number, because the mean of its divisors is an integer number (83352739).

Almost surely, 2^166705477 is an apocalyptic number.

It is an amenable number.

166705477 is a deficient number, since it is larger than the sum of its proper divisors (1).

166705477 is an equidigital number, since it uses as much as digits as its factorization.

166705477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 43.

The square root of 166705477 is about 12911.4475176101. The cubic root of 166705477 is about 550.3639211329.

The spelling of 166705477 in words is "one hundred sixty-six million, seven hundred five thousand, four hundred seventy-seven".