68666713 has 4 divisors (see below), whose sum is σ = 68758180. Its totient is φ = 68575248.

The previous prime is 68666711. The next prime is 68666749. The reversal of 68666713 is 31766686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52881984 + 15784729 = 7272^2 + 3973^2 .

It is a cyclic number.

It is not a de Polignac number, because 68666713 - 2¹ = 68666711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68666713.

It is not an unprimeable number, because it can be changed into a prime (68666711) 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 in 3 ways as a sum of consecutive naturals, for example, 44598 + ... + 46111.

It is an arithmetic number, because the mean of its divisors is an integer number (17189545).

Almost surely, 2^68666713 is an apocalyptic number.

It is an amenable number.

68666713 is a deficient number, since it is larger than the sum of its proper divisors (91467).

68666713 is an equidigital number, since it uses as much as digits as its factorization.

68666713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91466.

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

The square root of 68666713 is about 8286.5380588036. The cubic root of 68666713 is about 409.4951410333.

The spelling of 68666713 in words is "sixty-eight million, six hundred sixty-six thousand, seven hundred thirteen".