166006639 has 2 divisors, whose sum is σ = 166006640. Its totient is φ = 166006638.

The previous prime is 166006601. The next prime is 166006661. The reversal of 166006639 is 936600661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166006639 - 2¹¹ = 166004591 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166006598 and 166006607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166006669) 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, 83003319 + 83003320.

It is an arithmetic number, because the mean of its divisors is an integer number (83003320).

Almost surely, 2^166006639 is an apocalyptic number.

166006639 is a deficient number, since it is larger than the sum of its proper divisors (1).

166006639 is an equidigital number, since it uses as much as digits as its factorization.

166006639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 166006639 is about 12884.3563673161. The cubic root of 166006639 is about 549.5937926278.

The spelling of 166006639 in words is "one hundred sixty-six million, six thousand, six hundred thirty-nine".