68906394481 has 2 divisors, whose sum is σ = 68906394482. Its totient is φ = 68906394480.

The previous prime is 68906394451. The next prime is 68906394493. The reversal of 68906394481 is 18449360986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47915021025 + 20991373456 = 218895^2 + 144884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68906394481 is a prime.

It is a super-2 number, since 2×68906394481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68906394421) 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, 34453197240 + 34453197241.

It is an arithmetic number, because the mean of its divisors is an integer number (34453197241).

Almost surely, 2^68906394481 is an apocalyptic number.

It is an amenable number.

68906394481 is a deficient number, since it is larger than the sum of its proper divisors (1).

68906394481 is an equidigital number, since it uses as much as digits as its factorization.

68906394481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 68906394481 in words is "sixty-eight billion, nine hundred six million, three hundred ninety-four thousand, four hundred eighty-one".