166649543443 has 2 divisors, whose sum is σ = 166649543444. Its totient is φ = 166649543442.

The previous prime is 166649543407. The next prime is 166649543461. The reversal of 166649543443 is 344345946661.

166649543443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166649543443 is a prime.

It is not a weakly prime, because it can be changed into another prime (166647543443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83324771721 + 83324771722.

It is an arithmetic number, because the mean of its divisors is an integer number (83324771722).

Almost surely, 2^166649543443 is an apocalyptic number.

166649543443 is a deficient number, since it is larger than the sum of its proper divisors (1).

166649543443 is an equidigital number, since it uses as much as digits as its factorization.

166649543443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 55.

The spelling of 166649543443 in words is "one hundred sixty-six billion, six hundred forty-nine million, five hundred forty-three thousand, four hundred forty-three".