166216763 has 2 divisors, whose sum is σ = 166216764. Its totient is φ = 166216762.

The previous prime is 166216759. The next prime is 166216783. The reversal of 166216763 is 367612661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166216763 - 2² = 166216759 is a prime.

It is not a weakly prime, because it can be changed into another prime (166216703) 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, 83108381 + 83108382.

It is an arithmetic number, because the mean of its divisors is an integer number (83108382).

Almost surely, 2^166216763 is an apocalyptic number.

166216763 is a deficient number, since it is larger than the sum of its proper divisors (1).

166216763 is an equidigital number, since it uses as much as digits as its factorization.

166216763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 166216763 is about 12892.5080182252. The cubic root of 166216763 is about 549.8255788516.

The spelling of 166216763 in words is "one hundred sixty-six million, two hundred sixteen thousand, seven hundred sixty-three".