68876639933 has 4 divisors (see below), whose sum is σ = 70738170780. Its totient is φ = 67015109088.

The previous prime is 68876639929. The next prime is 68876639971. The reversal of 68876639933 is 33993667886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33993667886 = 2 ⋅16996833943.

It can be written as a sum of positive squares in 2 ways, for example, as 35797396804 + 33079243129 = 189202^2 + 181877^2 .

It is a cyclic number.

It is not a de Polignac number, because 68876639933 - 2² = 68876639929 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68876629933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930765368 + ... + 930765441.

It is an arithmetic number, because the mean of its divisors is an integer number (17684542695).

Almost surely, 2^68876639933 is an apocalyptic number.

It is an amenable number.

68876639933 is a deficient number, since it is larger than the sum of its proper divisors (1861530847).

68876639933 is a wasteful number, since it uses less digits than its factorization.

68876639933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861530846.

The product of its digits is 211631616, while the sum is 68.

The spelling of 68876639933 in words is "sixty-eight billion, eight hundred seventy-six million, six hundred thirty-nine thousand, nine hundred thirty-three".