6789828978721 has 4 divisors (see below), whose sum is σ = 7023961012500. Its totient is φ = 6555696944944.

The previous prime is 6789828978623. The next prime is 6789828978817. The reversal of 6789828978721 is 1278798289876.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1461949410321 + 5327879568400 = 1209111^2 + 2308220^2 .

It is a cyclic number.

It is not a de Polignac number, because 6789828978721 - 2³⁷ = 6652390025249 is a prime.

It is a super-2 number, since 2×6789828978721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6789888978721) 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, 117066016846 + ... + 117066016903.

It is an arithmetic number, because the mean of its divisors is an integer number (1755990253125).

Almost surely, 2^{6789828978721} is an apocalyptic number.

It is an amenable number.

6789828978721 is a deficient number, since it is larger than the sum of its proper divisors (234132033779).

6789828978721 is a wasteful number, since it uses less digits than its factorization.

6789828978721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234132033778.

The product of its digits is 2731180032, while the sum is 82.

The spelling of 6789828978721 in words is "six trillion, seven hundred eighty-nine billion, eight hundred twenty-eight million, nine hundred seventy-eight thousand, seven hundred twenty-one".