166843649 has 8 divisors (see below), whose sum is σ = 190767168. Its totient is φ = 142942320.

The previous prime is 166843639. The next prime is 166843697. The reversal of 166843649 is 946348661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166843649 - 2⁸ = 166843393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166843639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16334 + ... + 24504.

It is an arithmetic number, because the mean of its divisors is an integer number (23845896).

Almost surely, 2^166843649 is an apocalyptic number.

It is an amenable number.

166843649 is a deficient number, since it is larger than the sum of its proper divisors (23923519).

166843649 is an equidigital number, since it uses as much as digits as its factorization.

166843649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11095.

The product of its digits is 746496, while the sum is 47.

The square root of 166843649 is about 12916.7971649322. The cubic root of 166843649 is about 550.5159335025.

The spelling of 166843649 in words is "one hundred sixty-six million, eight hundred forty-three thousand, six hundred forty-nine".