166726687 has 2 divisors, whose sum is σ = 166726688. Its totient is φ = 166726686.

The previous prime is 166726663. The next prime is 166726697. The reversal of 166726687 is 786627661.

It is a strong prime.

It is an emirp because it is prime and its reverse (786627661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166726687 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166726687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166726697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83363343 + 83363344.

It is an arithmetic number, because the mean of its divisors is an integer number (83363344).

Almost surely, 2^166726687 is an apocalyptic number.

166726687 is a deficient number, since it is larger than the sum of its proper divisors (1).

166726687 is an equidigital number, since it uses as much as digits as its factorization.

166726687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 166726687 is about 12912.2688556272. The cubic root of 166726687 is about 550.3872611454.

The spelling of 166726687 in words is "one hundred sixty-six million, seven hundred twenty-six thousand, six hundred eighty-seven".