68498207891 has 2 divisors, whose sum is σ = 68498207892. Its totient is φ = 68498207890.

The previous prime is 68498207881. The next prime is 68498207893. The reversal of 68498207891 is 19870289486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68498207891 is a prime.

Together with 68498207893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68498207893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34249103945 + 34249103946.

It is an arithmetic number, because the mean of its divisors is an integer number (34249103946).

Almost surely, 2^68498207891 is an apocalyptic number.

68498207891 is a deficient number, since it is larger than the sum of its proper divisors (1).

68498207891 is an equidigital number, since it uses as much as digits as its factorization.

68498207891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 68498207891 in words is "sixty-eight billion, four hundred ninety-eight million, two hundred seven thousand, eight hundred ninety-one".