68506836791 has 36 divisors (see below), whose sum is σ = 75191413752. Its totient is φ = 62403372000.

The previous prime is 68506836757. The next prime is 68506836821. The reversal of 68506836791 is 19763860586.

It is a de Polignac number, because none of the positive numbers 2^k-68506836791 is a prime.

It is a super-2 number, since 2×68506836791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68506836791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68506836731) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62792156 + ... + 62793246.

It is an arithmetic number, because the mean of its divisors is an integer number (2088650382).

Almost surely, 2^68506836791 is an apocalyptic number.

68506836791 is a deficient number, since it is larger than the sum of its proper divisors (6684576961).

68506836791 is a wasteful number, since it uses less digits than its factorization.

68506836791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 68506836791 in words is "sixty-eight billion, five hundred six million, eight hundred thirty-six thousand, seven hundred ninety-one".