166842647 has 2 divisors, whose sum is σ = 166842648. Its totient is φ = 166842646.

The previous prime is 166842587. The next prime is 166842659. The reversal of 166842647 is 746248661.

It is a strong prime.

It is an emirp because it is prime and its reverse (746248661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166842647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166842598 and 166842607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166892647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83421323 + 83421324.

It is an arithmetic number, because the mean of its divisors is an integer number (83421324).

Almost surely, 2^166842647 is an apocalyptic number.

166842647 is a deficient number, since it is larger than the sum of its proper divisors (1).

166842647 is an equidigital number, since it uses as much as digits as its factorization.

166842647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The square root of 166842647 is about 12916.7583781690. The cubic root of 166842647 is about 550.5148314366.

The spelling of 166842647 in words is "one hundred sixty-six million, eight hundred forty-two thousand, six hundred forty-seven".