68873818549 has 2 divisors, whose sum is σ = 68873818550. Its totient is φ = 68873818548.

The previous prime is 68873818543. The next prime is 68873818571. The reversal of 68873818549 is 94581837886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40639737649 + 28234080900 = 201593^2 + 168030^2 .

It is a cyclic number.

It is not a de Polignac number, because 68873818549 - 2¹⁹ = 68873294261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68873818543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34436909274 + 34436909275.

It is an arithmetic number, because the mean of its divisors is an integer number (34436909275).

Almost surely, 2^68873818549 is an apocalyptic number.

It is an amenable number.

68873818549 is a deficient number, since it is larger than the sum of its proper divisors (1).

68873818549 is an equidigital number, since it uses as much as digits as its factorization.

68873818549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92897280, while the sum is 67.

The spelling of 68873818549 in words is "sixty-eight billion, eight hundred seventy-three million, eight hundred eighteen thousand, five hundred forty-nine".