68784969931 has 2 divisors, whose sum is σ = 68784969932. Its totient is φ = 68784969930.

The previous prime is 68784969923. The next prime is 68784969943. The reversal of 68784969931 is 13996948786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68784969931 - 2³ = 68784969923 is a prime.

It is a super-2 number, since 2×68784969931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68784969031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34392484965 + 34392484966.

It is an arithmetic number, because the mean of its divisors is an integer number (34392484966).

Almost surely, 2^68784969931 is an apocalyptic number.

68784969931 is a deficient number, since it is larger than the sum of its proper divisors (1).

68784969931 is an equidigital number, since it uses as much as digits as its factorization.

68784969931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141087744, while the sum is 70.

The spelling of 68784969931 in words is "sixty-eight billion, seven hundred eighty-four million, nine hundred sixty-nine thousand, nine hundred thirty-one".