166919964899 has 2 divisors, whose sum is σ = 166919964900. Its totient is φ = 166919964898.

The previous prime is 166919964889. The next prime is 166919964943. The reversal of 166919964899 is 998469919661.

166919964899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166919964899 is a prime.

It is not a weakly prime, because it can be changed into another prime (166919964859) 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, 83459982449 + 83459982450.

It is an arithmetic number, because the mean of its divisors is an integer number (83459982450).

Almost surely, 2^166919964899 is an apocalyptic number.

166919964899 is a deficient number, since it is larger than the sum of its proper divisors (1).

166919964899 is an equidigital number, since it uses as much as digits as its factorization.

166919964899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408146688, while the sum is 77.

The spelling of 166919964899 in words is "one hundred sixty-six billion, nine hundred nineteen million, nine hundred sixty-four thousand, eight hundred ninety-nine".