166884491 has 2 divisors, whose sum is σ = 166884492. Its totient is φ = 166884490.

The previous prime is 166884479. The next prime is 166884539. The reversal of 166884491 is 194488661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166884491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166884791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83442245 + 83442246.

It is an arithmetic number, because the mean of its divisors is an integer number (83442246).

Almost surely, 2^166884491 is an apocalyptic number.

166884491 is a deficient number, since it is larger than the sum of its proper divisors (1).

166884491 is an equidigital number, since it uses as much as digits as its factorization.

166884491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The square root of 166884491 is about 12918.3780328647. The cubic root of 166884491 is about 550.5608504801.

The spelling of 166884491 in words is "one hundred sixty-six million, eight hundred eighty-four thousand, four hundred ninety-one".