6856667369 has 2 divisors, whose sum is σ = 6856667370. Its totient is φ = 6856667368.

The previous prime is 6856667329. The next prime is 6856667387. The reversal of 6856667369 is 9637666586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6672929344 + 183738025 = 81688^2 + 13555^2 .

It is a cyclic number.

It is not a de Polignac number, because 6856667369 - 2¹⁶ = 6856601833 is a prime.

It is a super-2 number, since 2×6856667369² = 94027774818218764322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6856667329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428333684 + 3428333685.

It is an arithmetic number, because the mean of its divisors is an integer number (3428333685).

Almost surely, 2^6856667369 is an apocalyptic number.

It is an amenable number.

6856667369 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856667369 is an equidigital number, since it uses as much as digits as its factorization.

6856667369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 62.

The square root of 6856667369 is about 82804.9960388864. The cubic root of 6856667369 is about 1899.7845895217.

The spelling of 6856667369 in words is "six billion, eight hundred fifty-six million, six hundred sixty-seven thousand, three hundred sixty-nine".