68438222429 has 2 divisors, whose sum is σ = 68438222430. Its totient is φ = 68438222428.

The previous prime is 68438222351. The next prime is 68438222431. The reversal of 68438222429 is 92422283486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67702999204 + 735223225 = 260198^2 + 27115^2 .

It is a cyclic number.

It is not a de Polignac number, because 68438222429 - 2¹⁶ = 68438156893 is a prime.

Together with 68438222431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68438222729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34219111214 + 34219111215.

It is an arithmetic number, because the mean of its divisors is an integer number (34219111215).

Almost surely, 2^68438222429 is an apocalyptic number.

It is an amenable number.

68438222429 is a deficient number, since it is larger than the sum of its proper divisors (1).

68438222429 is an equidigital number, since it uses as much as digits as its factorization.

68438222429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 50.

The spelling of 68438222429 in words is "sixty-eight billion, four hundred thirty-eight million, two hundred twenty-two thousand, four hundred twenty-nine".