6768971639 has 4 divisors (see below), whose sum is σ = 6774167856. Its totient is φ = 6763775424.

The previous prime is 6768971593. The next prime is 6768971641. The reversal of 6768971639 is 9361798676.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6768971639 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 (6768971669) 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, 2596154 + ... + 2598759.

It is an arithmetic number, because the mean of its divisors is an integer number (1693541964).

Almost surely, 2^6768971639 is an apocalyptic number.

6768971639 is a deficient number, since it is larger than the sum of its proper divisors (5196217).

6768971639 is a wasteful number, since it uses less digits than its factorization.

6768971639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196216.

The product of its digits is 20575296, while the sum is 62.

The square root of 6768971639 is about 82273.7603309828. The cubic root of 6768971639 is about 1891.6504939844.

The spelling of 6768971639 in words is "six billion, seven hundred sixty-eight million, nine hundred seventy-one thousand, six hundred thirty-nine".