166993863719 has 2 divisors, whose sum is σ = 166993863720. Its totient is φ = 166993863718.

The previous prime is 166993863689. The next prime is 166993863721. The reversal of 166993863719 is 917368399661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166993863719 is a prime.

It is a super-2 number, since 2×166993863719² (a number of 23 digits) contains 22 as substring.

Together with 166993863721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166993866719) 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, 83496931859 + 83496931860.

It is an arithmetic number, because the mean of its divisors is an integer number (83496931860).

Almost surely, 2^166993863719 is an apocalyptic number.

166993863719 is a deficient number, since it is larger than the sum of its proper divisors (1).

166993863719 is an equidigital number, since it uses as much as digits as its factorization.

166993863719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 68.

The spelling of 166993863719 in words is "one hundred sixty-six billion, nine hundred ninety-three million, eight hundred sixty-three thousand, seven hundred nineteen".