166311618269 has 2 divisors, whose sum is σ = 166311618270. Its totient is φ = 166311618268.

The previous prime is 166311618259. The next prime is 166311618323. The reversal of 166311618269 is 962816113661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85388437369 + 80923180900 = 292213^2 + 284470^2 .

It is a cyclic number.

It is not a de Polignac number, because 166311618269 - 2¹² = 166311614173 is a prime.

It is a super-2 number, since 2×166311618269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166311618259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83155809134 + 83155809135.

It is an arithmetic number, because the mean of its divisors is an integer number (83155809135).

Almost surely, 2^166311618269 is an apocalyptic number.

It is an amenable number.

166311618269 is a deficient number, since it is larger than the sum of its proper divisors (1).

166311618269 is an equidigital number, since it uses as much as digits as its factorization.

166311618269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The spelling of 166311618269 in words is "one hundred sixty-six billion, three hundred eleven million, six hundred eighteen thousand, two hundred sixty-nine".