8216666123 has 2 divisors, whose sum is σ = 8216666124. Its totient is φ = 8216666122.

The previous prime is 8216666111. The next prime is 8216666153. The reversal of 8216666123 is 3216666128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8216666123 - 2⁸ = 8216665867 is a prime.

It is a super-2 number, since 2×8216666123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8216666153) 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, 4108333061 + 4108333062.

It is an arithmetic number, because the mean of its divisors is an integer number (4108333062).

Almost surely, 2^8216666123 is an apocalyptic number.

8216666123 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216666123 is an equidigital number, since it uses as much as digits as its factorization.

8216666123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 8216666123 is about 90645.8279403967. The cubic root of 8216666123 is about 2017.8949186552.

The spelling of 8216666123 in words is "eight billion, two hundred sixteen million, six hundred sixty-six thousand, one hundred twenty-three".