166166923099 has 2 divisors, whose sum is σ = 166166923100. Its totient is φ = 166166923098.

The previous prime is 166166923073. The next prime is 166166923121. The reversal of 166166923099 is 990329661661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166166923099 - 2⁹ = 166166922587 is a prime.

It is a super-2 number, since 2×166166923099² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166166929099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83083461549 + 83083461550.

It is an arithmetic number, because the mean of its divisors is an integer number (83083461550).

Almost surely, 2^166166923099 is an apocalyptic number.

166166923099 is a deficient number, since it is larger than the sum of its proper divisors (1).

166166923099 is an equidigital number, since it uses as much as digits as its factorization.

166166923099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5668704, while the sum is 58.

The spelling of 166166923099 in words is "one hundred sixty-six billion, one hundred sixty-six million, nine hundred twenty-three thousand, ninety-nine".