168666893 has 2 divisors, whose sum is σ = 168666894. Its totient is φ = 168666892.

The previous prime is 168666863. The next prime is 168666913. The reversal of 168666893 is 398666861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155800324 + 12866569 = 12482^2 + 3587^2 .

It is a cyclic number.

It is not a de Polignac number, because 168666893 - 2¹⁸ = 168404749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168666803) 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 as a sum of consecutive naturals, namely, 84333446 + 84333447.

It is an arithmetic number, because the mean of its divisors is an integer number (84333447).

Almost surely, 2^168666893 is an apocalyptic number.

It is an amenable number.

168666893 is a deficient number, since it is larger than the sum of its proper divisors (1).

168666893 is an equidigital number, since it uses as much as digits as its factorization.

168666893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 53.

The square root of 168666893 is about 12987.1818729084. The cubic root of 168666893 is about 552.5139932166.

The spelling of 168666893 in words is "one hundred sixty-eight million, six hundred sixty-six thousand, eight hundred ninety-three".