68643456823 has 16 divisors (see below), whose sum is σ = 73980649600. Its totient is φ = 63480503520.

The previous prime is 68643456803. The next prime is 68643456857. The reversal of 68643456823 is 32865434686.

It is a cyclic number.

It is not a de Polignac number, because 68643456823 - 2⁹ = 68643456311 is a prime.

It is a super-2 number, since 2×68643456823² (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 (68643456803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1398268 + ... + 1446526.

It is an arithmetic number, because the mean of its divisors is an integer number (4623790600).

Almost surely, 2^68643456823 is an apocalyptic number.

68643456823 is a deficient number, since it is larger than the sum of its proper divisors (5337192777).

68643456823 is a wasteful number, since it uses less digits than its factorization.

68643456823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50062.

The product of its digits is 19906560, while the sum is 55.

The spelling of 68643456823 in words is "sixty-eight billion, six hundred forty-three million, four hundred fifty-six thousand, eight hundred twenty-three".