166989659 has 2 divisors, whose sum is σ = 166989660. Its totient is φ = 166989658.

The previous prime is 166989649. The next prime is 166989673. The reversal of 166989659 is 956989661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166989659 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166989598 and 166989607.

It is not a weakly prime, because it can be changed into another prime (166989619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83494829 + 83494830.

It is an arithmetic number, because the mean of its divisors is an integer number (83494830).

Almost surely, 2^166989659 is an apocalyptic number.

166989659 is a deficient number, since it is larger than the sum of its proper divisors (1).

166989659 is an equidigital number, since it uses as much as digits as its factorization.

166989659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6298560, while the sum is 59.

The square root of 166989659 is about 12922.4478718237. The cubic root of 166989659 is about 550.6764778113.

The spelling of 166989659 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, six hundred fifty-nine".