166797066209 has 2 divisors, whose sum is σ = 166797066210. Its totient is φ = 166797066208.

The previous prime is 166797066197. The next prime is 166797066269. The reversal of 166797066209 is 902660797661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158322022609 + 8475043600 = 397897^2 + 92060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166797066209 is a prime.

It is a super-2 number, since 2×166797066209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166797066269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83398533104 + 83398533105.

It is an arithmetic number, because the mean of its divisors is an integer number (83398533105).

Almost surely, 2^166797066209 is an apocalyptic number.

It is an amenable number.

166797066209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166797066209 is an equidigital number, since it uses as much as digits as its factorization.

166797066209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The spelling of 166797066209 in words is "one hundred sixty-six billion, seven hundred ninety-seven million, sixty-six thousand, two hundred nine".