68666593 has 2 divisors, whose sum is σ = 68666594. Its totient is φ = 68666592.

The previous prime is 68666579. The next prime is 68666599. The reversal of 68666593 is 39566686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44930209 + 23736384 = 6703^2 + 4872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68666593 is a prime.

It is not a weakly prime, because it can be changed into another prime (68666599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34333296 + 34333297.

It is an arithmetic number, because the mean of its divisors is an integer number (34333297).

Almost surely, 2^68666593 is an apocalyptic number.

It is an amenable number.

68666593 is a deficient number, since it is larger than the sum of its proper divisors (1).

68666593 is an equidigital number, since it uses as much as digits as its factorization.

68666593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 49.

The square root of 68666593 is about 8286.5308181410. The cubic root of 68666593 is about 409.4949024925.

The spelling of 68666593 in words is "sixty-eight million, six hundred sixty-six thousand, five hundred ninety-three".