6816636769 has 4 divisors (see below), whose sum is σ = 6841245844. Its totient is φ = 6792027696.

The previous prime is 6816636751. The next prime is 6816636781. The reversal of 6816636769 is 9676366186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9676366186 = 2 ⋅4838183093.

It can be written as a sum of positive squares in 2 ways, for example, as 962550625 + 5854086144 = 31025^2 + 76512^2 .

It is a cyclic number.

It is not a de Polignac number, because 6816636769 - 2⁵ = 6816636737 is a prime.

It is a super-2 number, since 2×6816636769² = 92933073680965518722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6816636709) 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, 12304122 + ... + 12304675.

It is an arithmetic number, because the mean of its divisors is an integer number (1710311461).

Almost surely, 2^6816636769 is an apocalyptic number.

It is an amenable number.

6816636769 is a deficient number, since it is larger than the sum of its proper divisors (24609075).

6816636769 is a wasteful number, since it uses less digits than its factorization.

6816636769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24609074.

The product of its digits is 11757312, while the sum is 58.

The square root of 6816636769 is about 82562.9261169927. The cubic root of 6816636769 is about 1896.0802633900.

The spelling of 6816636769 in words is "six billion, eight hundred sixteen million, six hundred thirty-six thousand, seven hundred sixty-nine".