166959857 has 2 divisors, whose sum is σ = 166959858. Its totient is φ = 166959856.

The previous prime is 166959853. The next prime is 166959887. The reversal of 166959857 is 758959661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 2119936 = 12839^2 + 1456^2 .

It is a cyclic number.

It is not a de Polignac number, because 166959857 - 2² = 166959853 is a prime.

It is not a weakly prime, because it can be changed into another prime (166959851) 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, 83479928 + 83479929.

It is an arithmetic number, because the mean of its divisors is an integer number (83479929).

Almost surely, 2^166959857 is an apocalyptic number.

It is an amenable number.

166959857 is a deficient number, since it is larger than the sum of its proper divisors (1).

166959857 is an equidigital number, since it uses as much as digits as its factorization.

166959857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 56.

The square root of 166959857 is about 12921.2947106704. The cubic root of 166959857 is about 550.6437168270.

The spelling of 166959857 in words is "one hundred sixty-six million, nine hundred fifty-nine thousand, eight hundred fifty-seven".