68723818858 has 4 divisors (see below), whose sum is σ = 103085728290. Its totient is φ = 34361909428.

The previous prime is 68723818837. The next prime is 68723818903. The reversal of 68723818858 is 85881832786.

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

It can be written as a sum of positive squares in only one way, i.e., 64858336929 + 3865481929 = 254673^2 + 62173^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68723818858.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17180954713 + ... + 17180954716.

Almost surely, 2^68723818858 is an apocalyptic number.

68723818858 is a deficient number, since it is larger than the sum of its proper divisors (34361909432).

68723818858 is a wasteful number, since it uses less digits than its factorization.

68723818858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34361909431.

The product of its digits is 41287680, while the sum is 64.

The spelling of 68723818858 in words is "sixty-eight billion, seven hundred twenty-three million, eight hundred eighteen thousand, eight hundred fifty-eight".