166606997 has 2 divisors, whose sum is σ = 166606998. Its totient is φ = 166606996.

The previous prime is 166606981. The next prime is 166607011. The reversal of 166606997 is 799606661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94458961 + 72148036 = 9719^2 + 8494^2 .

It is a cyclic number.

It is not a de Polignac number, because 166606997 - 2⁴ = 166606981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166608997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83303498 + 83303499.

It is an arithmetic number, because the mean of its divisors is an integer number (83303499).

Almost surely, 2^166606997 is an apocalyptic number.

It is an amenable number.

166606997 is a deficient number, since it is larger than the sum of its proper divisors (1).

166606997 is an equidigital number, since it uses as much as digits as its factorization.

166606997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 166606997 is about 12907.6332842237. The cubic root of 166606997 is about 550.2555253438.

The spelling of 166606997 in words is "one hundred sixty-six million, six hundred six thousand, nine hundred ninety-seven".