166846535857 has 2 divisors, whose sum is σ = 166846535858. Its totient is φ = 166846535856.

The previous prime is 166846535831. The next prime is 166846535879. The reversal of 166846535857 is 758535648661.

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., 165125198736 + 1721337121 = 406356^2 + 41489^2 .

It is a cyclic number.

It is not a de Polignac number, because 166846535857 - 2⁷ = 166846535729 is a prime.

It is a super-3 number, since 3×166846535857³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (166840535857) 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, 83423267928 + 83423267929.

It is an arithmetic number, because the mean of its divisors is an integer number (83423267929).

Almost surely, 2^166846535857 is an apocalyptic number.

It is an amenable number.

166846535857 is a deficient number, since it is larger than the sum of its proper divisors (1).

166846535857 is an equidigital number, since it uses as much as digits as its factorization.

166846535857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152000, while the sum is 64.

The spelling of 166846535857 in words is "one hundred sixty-six billion, eight hundred forty-six million, five hundred thirty-five thousand, eight hundred fifty-seven".