166767675209 has 2 divisors, whose sum is σ = 166767675210. Its totient is φ = 166767675208.

The previous prime is 166767675163. The next prime is 166767675211. The reversal of 166767675209 is 902576767661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149494356025 + 17273319184 = 386645^2 + 131428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166767675209 is a prime.

It is a super-2 number, since 2×166767675209² (a number of 23 digits) contains 22 as substring.

Together with 166767675211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166767675289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83383837604 + 83383837605.

It is an arithmetic number, because the mean of its divisors is an integer number (83383837605).

Almost surely, 2^166767675209 is an apocalyptic number.

It is an amenable number.

166767675209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166767675209 is an equidigital number, since it uses as much as digits as its factorization.

166767675209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40007520, while the sum is 62.

The spelling of 166767675209 in words is "one hundred sixty-six billion, seven hundred sixty-seven million, six hundred seventy-five thousand, two hundred nine".