68516666789 has 2 divisors, whose sum is σ = 68516666790. Its totient is φ = 68516666788.

The previous prime is 68516666773. The next prime is 68516666833. The reversal of 68516666789 is 98766661586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66753506689 + 1763160100 = 258367^2 + 41990^2 .

It is a cyclic number.

It is not a de Polignac number, because 68516666789 - 2⁴ = 68516666773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68516666719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258333394 + 34258333395.

It is an arithmetic number, because the mean of its divisors is an integer number (34258333395).

Almost surely, 2^68516666789 is an apocalyptic number.

It is an amenable number.

68516666789 is a deficient number, since it is larger than the sum of its proper divisors (1).

68516666789 is an equidigital number, since it uses as much as digits as its factorization.

68516666789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 68.

The spelling of 68516666789 in words is "sixty-eight billion, five hundred sixteen million, six hundred sixty-six thousand, seven hundred eighty-nine".