68787446209 has 2 divisors, whose sum is σ = 68787446210. Its totient is φ = 68787446208.

The previous prime is 68787446207. The next prime is 68787446227. The reversal of 68787446209 is 90264478786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66811910400 + 1975535809 = 258480^2 + 44447^2 .

It is a cyclic number.

It is not a de Polignac number, because 68787446209 - 2¹ = 68787446207 is a prime.

Together with 68787446207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68787446201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34393723104 + 34393723105.

It is an arithmetic number, because the mean of its divisors is an integer number (34393723105).

Almost surely, 2^68787446209 is an apocalyptic number.

It is an amenable number.

68787446209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68787446209 is an equidigital number, since it uses as much as digits as its factorization.

68787446209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 68787446209 in words is "sixty-eight billion, seven hundred eighty-seven million, four hundred forty-six thousand, two hundred nine".