68781823664 has 20 divisors (see below), whose sum is σ = 133648842504. Its totient is φ = 34291799808.

The previous prime is 68781823657. The next prime is 68781823703. The reversal of 68781823664 is 46632818786.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6188777 + ... + 6199880.

Almost surely, 2^68781823664 is an apocalyptic number.

It is an amenable number.

68781823664 is a deficient number, since it is larger than the sum of its proper divisors (64867018840).

68781823664 is a wasteful number, since it uses less digits than its factorization.

68781823664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389012 (or 12389006 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 59.

The spelling of 68781823664 in words is "sixty-eight billion, seven hundred eighty-one million, eight hundred twenty-three thousand, six hundred sixty-four".