68666173 has 2 divisors, whose sum is σ = 68666174. Its totient is φ = 68666172.

The previous prime is 68666167. The next prime is 68666177. The reversal of 68666173 is 37166686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 2683044 = 8123^2 + 1638^2 .

68666173 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 68666173 - 2²¹ = 66569021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68666177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34333086 + 34333087.

It is an arithmetic number, because the mean of its divisors is an integer number (34333087).

Almost surely, 2^68666173 is an apocalyptic number.

It is an amenable number.

68666173 is a deficient number, since it is larger than the sum of its proper divisors (1).

68666173 is an equidigital number, since it uses as much as digits as its factorization.

68666173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 68666173 is about 8286.5054757720. The cubic root of 68666173 is about 409.4940675974.

The spelling of 68666173 in words is "sixty-eight million, six hundred sixty-six thousand, one hundred seventy-three".