68838318421 has 2 divisors, whose sum is σ = 68838318422. Its totient is φ = 68838318420.

The previous prime is 68838318389. The next prime is 68838318449. The reversal of 68838318421 is 12481383886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57873924900 + 10964393521 = 240570^2 + 104711^2 .

It is a cyclic number.

It is not a de Polignac number, because 68838318421 - 2⁵ = 68838318389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68838318721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34419159210 + 34419159211.

It is an arithmetic number, because the mean of its divisors is an integer number (34419159211).

Almost surely, 2^68838318421 is an apocalyptic number.

It is an amenable number.

68838318421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68838318421 is an equidigital number, since it uses as much as digits as its factorization.

68838318421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1769472, while the sum is 52.

The spelling of 68838318421 in words is "sixty-eight billion, eight hundred thirty-eight million, three hundred eighteen thousand, four hundred twenty-one".