166663933 has 2 divisors, whose sum is σ = 166663934. Its totient is φ = 166663932.

The previous prime is 166663883. The next prime is 166663951. The reversal of 166663933 is 339366661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141443449 + 25220484 = 11893^2 + 5022^2 .

It is a cyclic number.

It is not a de Polignac number, because 166663933 - 2²¹ = 164566781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166663933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166663033) 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, 83331966 + 83331967.

It is an arithmetic number, because the mean of its divisors is an integer number (83331967).

Almost surely, 2^166663933 is an apocalyptic number.

It is an amenable number.

166663933 is a deficient number, since it is larger than the sum of its proper divisors (1).

166663933 is an equidigital number, since it uses as much as digits as its factorization.

166663933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 43.

The square root of 166663933 is about 12909.8386124692. The cubic root of 166663933 is about 550.3181993432.

The spelling of 166663933 in words is "one hundred sixty-six million, six hundred sixty-three thousand, nine hundred thirty-three".