166210133809 has 2 divisors, whose sum is σ = 166210133810. Its totient is φ = 166210133808.

The previous prime is 166210133743. The next prime is 166210133827. The reversal of 166210133809 is 908331012661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160885221025 + 5324912784 = 401105^2 + 72972^2 .

It is an emirp because it is prime and its reverse (908331012661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166210133809 - 2¹³ = 166210125617 is a prime.

It is not a weakly prime, because it can be changed into another prime (166210137809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83105066904 + 83105066905.

It is an arithmetic number, because the mean of its divisors is an integer number (83105066905).

Almost surely, 2^166210133809 is an apocalyptic number.

It is an amenable number.

166210133809 is a deficient number, since it is larger than the sum of its proper divisors (1).

166210133809 is an equidigital number, since it uses as much as digits as its factorization.

166210133809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 166210133809 in words is "one hundred sixty-six billion, two hundred ten million, one hundred thirty-three thousand, eight hundred nine".