68518777 has 2 divisors, whose sum is σ = 68518778. Its totient is φ = 68518776.

The previous prime is 68518739. The next prime is 68518781. The reversal of 68518777 is 77781586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63696361 + 4822416 = 7981^2 + 2196^2 .

It is a cyclic number.

It is not a de Polignac number, because 68518777 - 2¹¹ = 68516729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68518777.

It is not a weakly prime, because it can be changed into another prime (68518727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34259388 + 34259389.

It is an arithmetic number, because the mean of its divisors is an integer number (34259389).

Almost surely, 2^68518777 is an apocalyptic number.

It is an amenable number.

68518777 is a deficient number, since it is larger than the sum of its proper divisors (1).

68518777 is an equidigital number, since it uses as much as digits as its factorization.

68518777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 49.

The square root of 68518777 is about 8277.6069609519. The cubic root of 68518777 is about 409.2008566236.

The spelling of 68518777 in words is "sixty-eight million, five hundred eighteen thousand, seven hundred seventy-seven".