68251892809 has 2 divisors, whose sum is σ = 68251892810. Its totient is φ = 68251892808.

The previous prime is 68251892749. The next prime is 68251892857. The reversal of 68251892809 is 90829815286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52691825209 + 15560067600 = 229547^2 + 124740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68251892809 is a prime.

It is a super-2 number, since 2×68251892809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68251892879) 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, 34125946404 + 34125946405.

It is an arithmetic number, because the mean of its divisors is an integer number (34125946405).

Almost surely, 2^68251892809 is an apocalyptic number.

It is an amenable number.

68251892809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68251892809 is an equidigital number, since it uses as much as digits as its factorization.

68251892809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 68251892809 in words is "sixty-eight billion, two hundred fifty-one million, eight hundred ninety-two thousand, eight hundred nine".