166641967769 has 2 divisors, whose sum is σ = 166641967770. Its totient is φ = 166641967768.

The previous prime is 166641967711. The next prime is 166641967823. The reversal of 166641967769 is 967769146661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111692982025 + 54948985744 = 334205^2 + 234412^2 .

It is a cyclic number.

It is not a de Polignac number, because 166641967769 - 2²⁸ = 166373532313 is a prime.

It is a super-2 number, since 2×166641967769² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166641967699 and 166641967708.

It is not a weakly prime, because it can be changed into another prime (166641967969) 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, 83320983884 + 83320983885.

It is an arithmetic number, because the mean of its divisors is an integer number (83320983885).

Almost surely, 2^166641967769 is an apocalyptic number.

It is an amenable number.

166641967769 is a deficient number, since it is larger than the sum of its proper divisors (1).

166641967769 is an equidigital number, since it uses as much as digits as its factorization.

166641967769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123451776, while the sum is 68.

The spelling of 166641967769 in words is "one hundred sixty-six billion, six hundred forty-one million, nine hundred sixty-seven thousand, seven hundred sixty-nine".