166550999 has 2 divisors, whose sum is σ = 166551000. Its totient is φ = 166550998.

The previous prime is 166550977. The next prime is 166551001. The reversal of 166550999 is 999055661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166550999 is a prime.

It is a super-3 number, since 3×166550999³ (a number of 26 digits) contains 333 as substring.

Together with 166551001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166550929) 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, 83275499 + 83275500.

It is an arithmetic number, because the mean of its divisors is an integer number (83275500).

Almost surely, 2^166550999 is an apocalyptic number.

166550999 is a deficient number, since it is larger than the sum of its proper divisors (1).

166550999 is an equidigital number, since it uses as much as digits as its factorization.

166550999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 50.

The square root of 166550999 is about 12905.4639203711. The cubic root of 166550999 is about 550.1938699466.

The spelling of 166550999 in words is "one hundred sixty-six million, five hundred fifty thousand, nine hundred ninety-nine".