68978644123 has 4 divisors (see below), whose sum is σ = 70842931840. Its totient is φ = 67114356408.

The previous prime is 68978644087. The next prime is 68978644181. The reversal of 68978644123 is 32144687986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68978644123 - 2⁹ = 68978643611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68978624123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 932143803 + ... + 932143876.

It is an arithmetic number, because the mean of its divisors is an integer number (17710732960).

Almost surely, 2^68978644123 is an apocalyptic number.

68978644123 is a deficient number, since it is larger than the sum of its proper divisors (1864287717).

68978644123 is a wasteful number, since it uses less digits than its factorization.

68978644123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864287716.

The product of its digits is 13934592, while the sum is 58.

The spelling of 68978644123 in words is "sixty-eight billion, nine hundred seventy-eight million, six hundred forty-four thousand, one hundred twenty-three".