68889403409 has 2 divisors, whose sum is σ = 68889403410. Its totient is φ = 68889403408.

The previous prime is 68889403403. The next prime is 68889403411. The reversal of 68889403409 is 90430498886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45474283009 + 23415120400 = 213247^2 + 153020^2 .

It is a cyclic number.

It is not a de Polignac number, because 68889403409 - 2⁴ = 68889403393 is a prime.

It is a Sophie Germain prime.

Together with 68889403411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68889403403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34444701704 + 34444701705.

It is an arithmetic number, because the mean of its divisors is an integer number (34444701705).

Almost surely, 2^68889403409 is an apocalyptic number.

It is an amenable number.

68889403409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68889403409 is an equidigital number, since it uses as much as digits as its factorization.

68889403409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 68889403409 in words is "sixty-eight billion, eight hundred eighty-nine million, four hundred three thousand, four hundred nine".