68919221378 has 54 divisors (see below), whose sum is σ = 125822028969. Its totient is φ = 28228096512.

The previous prime is 68919221339. The next prime is 68919221407. The reversal of 68919221378 is 87312291986.

It can be written as a sum of positive squares in 2 ways, for example, as 62516501089 + 6402720289 = 250033^2 + 80017^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=185633.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 59773250 + ... + 59774402.

Almost surely, 2^68919221378 is an apocalyptic number.

68919221378 is a deficient number, since it is larger than the sum of its proper divisors (56902807591).

68919221378 is an equidigital number, since it uses as much as digits as its factorization.

68919221378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368 (or 1185 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 56.

The spelling of 68919221378 in words is "sixty-eight billion, nine hundred nineteen million, two hundred twenty-one thousand, three hundred seventy-eight".