68642123686 has 16 divisors (see below), whose sum is σ = 104827377600. Its totient is φ = 33705237888.

The previous prime is 68642123681. The next prime is 68642123723. The reversal of 68642123686 is 68632124686.

It is a super-2 number, since 2×68642123686² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68642123681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1368606 + ... + 1417873.

It is an arithmetic number, because the mean of its divisors is an integer number (6551711100).

Almost surely, 2^68642123686 is an apocalyptic number.

68642123686 is a deficient number, since it is larger than the sum of its proper divisors (36185253914).

68642123686 is a wasteful number, since it uses less digits than its factorization.

68642123686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786703.

The product of its digits is 3981312, while the sum is 52.

The spelling of 68642123686 in words is "sixty-eight billion, six hundred forty-two million, one hundred twenty-three thousand, six hundred eighty-six".