68686263517 has 2 divisors, whose sum is σ = 68686263518. Its totient is φ = 68686263516.

The previous prime is 68686263491. The next prime is 68686263553. The reversal of 68686263517 is 71536268686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38940707556 + 29745555961 = 197334^2 + 172469^2 .

It is a cyclic number.

It is not a de Polignac number, because 68686263517 - 2¹⁵ = 68686230749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68686263587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34343131758 + 34343131759.

It is an arithmetic number, because the mean of its divisors is an integer number (34343131759).

Almost surely, 2^68686263517 is an apocalyptic number.

It is an amenable number.

68686263517 is a deficient number, since it is larger than the sum of its proper divisors (1).

68686263517 is an equidigital number, since it uses as much as digits as its factorization.

68686263517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 58.

The spelling of 68686263517 in words is "sixty-eight billion, six hundred eighty-six million, two hundred sixty-three thousand, five hundred seventeen".