166784117 has 2 divisors, whose sum is σ = 166784118. Its totient is φ = 166784116.

The previous prime is 166784099. The next prime is 166784119. The reversal of 166784117 is 711487661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139263601 + 27520516 = 11801^2 + 5246^2 .

It is a cyclic number.

It is not a de Polignac number, because 166784117 - 2⁶ = 166784053 is a prime.

Together with 166784119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166784119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83392058 + 83392059.

It is an arithmetic number, because the mean of its divisors is an integer number (83392059).

Almost surely, 2^166784117 is an apocalyptic number.

It is an amenable number.

166784117 is a deficient number, since it is larger than the sum of its proper divisors (1).

166784117 is an equidigital number, since it uses as much as digits as its factorization.

166784117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 166784117 is about 12914.4925180976. The cubic root of 166784117 is about 550.4504486139.

The spelling of 166784117 in words is "one hundred sixty-six million, seven hundred eighty-four thousand, one hundred seventeen".