166475857 has 2 divisors, whose sum is σ = 166475858. Its totient is φ = 166475856.

The previous prime is 166475807. The next prime is 166475873. The reversal of 166475857 is 758574661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143137296 + 23338561 = 11964^2 + 4831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166475857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166475857.

It is not a weakly prime, because it can be changed into another prime (166475807) 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, 83237928 + 83237929.

It is an arithmetic number, because the mean of its divisors is an integer number (83237929).

Almost surely, 2^166475857 is an apocalyptic number.

It is an amenable number.

166475857 is a deficient number, since it is larger than the sum of its proper divisors (1).

166475857 is an equidigital number, since it uses as much as digits as its factorization.

166475857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 49.

The square root of 166475857 is about 12902.5523444007. The cubic root of 166475857 is about 550.1111147404. Note that the first 5 decimals are identical.

The spelling of 166475857 in words is "one hundred sixty-six million, four hundred seventy-five thousand, eight hundred fifty-seven".