166726663 has 2 divisors, whose sum is σ = 166726664. Its totient is φ = 166726662.

The previous prime is 166726661. The next prime is 166726687. The reversal of 166726663 is 366627661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166726663 - 2¹ = 166726661 is a prime.

Together with 166726661, 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 (166726661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83363331 + 83363332.

It is an arithmetic number, because the mean of its divisors is an integer number (83363332).

Almost surely, 2^166726663 is an apocalyptic number.

166726663 is a deficient number, since it is larger than the sum of its proper divisors (1).

166726663 is an equidigital number, since it uses as much as digits as its factorization.

166726663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 43.

The square root of 166726663 is about 12912.2679262785. The cubic root of 166726663 is about 550.3872347363.

The spelling of 166726663 in words is "one hundred sixty-six million, seven hundred twenty-six thousand, six hundred sixty-three".