166257473 has 2 divisors, whose sum is σ = 166257474. Its totient is φ = 166257472.

The previous prime is 166257431. The next prime is 166257503. The reversal of 166257473 is 374752661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153462544 + 12794929 = 12388^2 + 3577^2 .

It is an emirp because it is prime and its reverse (374752661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166257473 - 2¹² = 166253377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166257473.

It is not a weakly prime, because it can be changed into another prime (166251473) 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, 83128736 + 83128737.

It is an arithmetic number, because the mean of its divisors is an integer number (83128737).

Almost surely, 2^166257473 is an apocalyptic number.

It is an amenable number.

166257473 is a deficient number, since it is larger than the sum of its proper divisors (1).

166257473 is an equidigital number, since it uses as much as digits as its factorization.

166257473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 41.

The square root of 166257473 is about 12894.0867454814. The cubic root of 166257473 is about 549.8704631576.

The spelling of 166257473 in words is "one hundred sixty-six million, two hundred fifty-seven thousand, four hundred seventy-three".