68731312787 has 2 divisors, whose sum is σ = 68731312788. Its totient is φ = 68731312786.

The previous prime is 68731312777. The next prime is 68731312799. The reversal of 68731312787 is 78721313786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68731312787 - 2⁶ = 68731312723 is a prime.

It is not a weakly prime, because it can be changed into another prime (68731312717) 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 as a sum of consecutive naturals, namely, 34365656393 + 34365656394.

It is an arithmetic number, because the mean of its divisors is an integer number (34365656394).

Almost surely, 2^68731312787 is an apocalyptic number.

68731312787 is a deficient number, since it is larger than the sum of its proper divisors (1).

68731312787 is an equidigital number, since it uses as much as digits as its factorization.

68731312787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

Subtracting 68731312787 from its reverse (78721313786), we obtain a palindrome (9990000999).

The spelling of 68731312787 in words is "sixty-eight billion, seven hundred thirty-one million, three hundred twelve thousand, seven hundred eighty-seven".