166516223 has 2 divisors, whose sum is σ = 166516224. Its totient is φ = 166516222.

The previous prime is 166516219. The next prime is 166516237. The reversal of 166516223 is 322615661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166516223 - 2² = 166516219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166516223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166516213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258111 + 83258112.

It is an arithmetic number, because the mean of its divisors is an integer number (83258112).

Almost surely, 2^166516223 is an apocalyptic number.

166516223 is a deficient number, since it is larger than the sum of its proper divisors (1).

166516223 is an equidigital number, since it uses as much as digits as its factorization.

166516223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 166516223 is about 12904.1165137331. The cubic root of 166516223 is about 550.1555736210.

The spelling of 166516223 in words is "one hundred sixty-six million, five hundred sixteen thousand, two hundred twenty-three".