166163644469 has 2 divisors, whose sum is σ = 166163644470. Its totient is φ = 166163644468.

The previous prime is 166163644441. The next prime is 166163644483. The reversal of 166163644469 is 964446361661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155659444369 + 10504200100 = 394537^2 + 102490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166163644469 is a prime.

It is a super-2 number, since 2×166163644469² (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 (166163644489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83081822234 + 83081822235.

It is an arithmetic number, because the mean of its divisors is an integer number (83081822235).

Almost surely, 2^166163644469 is an apocalyptic number.

It is an amenable number.

166163644469 is a deficient number, since it is larger than the sum of its proper divisors (1).

166163644469 is an equidigital number, since it uses as much as digits as its factorization.

166163644469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 56.

The spelling of 166163644469 in words is "one hundred sixty-six billion, one hundred sixty-three million, six hundred forty-four thousand, four hundred sixty-nine".