68817881787 has 12 divisors (see below), whose sum is σ = 94304129976. Its totient is φ = 44638623360.

The previous prime is 68817881771. The next prime is 68817881809. The reversal of 68817881787 is 78718871886.

It is not a de Polignac number, because 68817881787 - 2⁴ = 68817881771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68817881707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8374014 + ... + 8382227.

It is an arithmetic number, because the mean of its divisors is an integer number (7858677498).

Almost surely, 2^68817881787 is an apocalyptic number.

68817881787 is a deficient number, since it is larger than the sum of its proper divisors (25486248189).

68817881787 is a wasteful number, since it uses less digits than its factorization.

68817881787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16756318 (or 16756281 counting only the distinct ones).

The product of its digits is 67436544, while the sum is 69.

Subtracting 68817881787 from its reverse (78718871886), we obtain a palindrome (9900990099).

The spelling of 68817881787 in words is "sixty-eight billion, eight hundred seventeen million, eight hundred eighty-one thousand, seven hundred eighty-seven".