68791988771 has 16 divisors (see below), whose sum is σ = 75683911680. Its totient is φ = 62008672320.

The previous prime is 68791988761. The next prime is 68791988807. The reversal of 68791988771 is 17788919786.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68791988771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68791988695 and 68791988704.

It is not an unprimeable number, because it can be changed into a prime (68791988701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556406 + ... + 668708.

It is an arithmetic number, because the mean of its divisors is an integer number (4730244480).

Almost surely, 2^68791988771 is an apocalyptic number.

68791988771 is a deficient number, since it is larger than the sum of its proper divisors (6891922909).

68791988771 is a wasteful number, since it uses less digits than its factorization.

68791988771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112786.

The product of its digits is 85349376, while the sum is 71.

The spelling of 68791988771 in words is "sixty-eight billion, seven hundred ninety-one million, nine hundred eighty-eight thousand, seven hundred seventy-one".