68031778648928 has 12 divisors (see below), whose sum is σ = 133937564215140. Its totient is φ = 34015889324448.

The previous prime is 68031778648903. The next prime is 68031778648957. The reversal of 68031778648928 is 82984687713086.

It is a super-2 number, since 2×68031778648928² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062996541358 + ... + 1062996541421.

It is an arithmetic number, because the mean of its divisors is an integer number (11161463684595).

Almost surely, 2^{68031778648928} is an apocalyptic number.

It is an amenable number.

68031778648928 is a deficient number, since it is larger than the sum of its proper divisors (65905785566212).

68031778648928 is a wasteful number, since it uses less digits than its factorization.

68031778648928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125993082789 (or 2125993082781 counting only the distinct ones).

The product of its (nonzero) digits is 1560674304, while the sum is 77.

The spelling of 68031778648928 in words is "sixty-eight trillion, thirty-one billion, seven hundred seventy-eight million, six hundred forty-eight thousand, nine hundred twenty-eight".