166859167693 has 2 divisors, whose sum is σ = 166859167694. Its totient is φ = 166859167692.

The previous prime is 166859167691. The next prime is 166859167781. The reversal of 166859167693 is 396761958661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166858361289 + 806404 = 408483^2 + 898^2 .

It is an emirp because it is prime and its reverse (396761958661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166859167693 - 2¹ = 166859167691 is a prime.

Together with 166859167691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166859167691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83429583846 + 83429583847.

It is an arithmetic number, because the mean of its divisors is an integer number (83429583847).

Almost surely, 2^166859167693 is an apocalyptic number.

It is an amenable number.

166859167693 is a deficient number, since it is larger than the sum of its proper divisors (1).

166859167693 is an equidigital number, since it uses as much as digits as its factorization.

166859167693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 67.

The spelling of 166859167693 in words is "one hundred sixty-six billion, eight hundred fifty-nine million, one hundred sixty-seven thousand, six hundred ninety-three".