6686808881 has 4 divisors (see below), whose sum is σ = 6688105200. Its totient is φ = 6685512564.

The previous prime is 6686808853. The next prime is 6686808889. The reversal of 6686808881 is 1888086866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1888086866 = 2 ⋅944043433.

It is a cyclic number.

It is not a de Polignac number, because 6686808881 - 2²² = 6682614577 is a prime.

It is a super-2 number, since 2×6686808881² = 89426826022040944322, which 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 6686808881.

It is not an unprimeable number, because it can be changed into a prime (6686808889) 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, 640391 + ... + 650748.

It is an arithmetic number, because the mean of its divisors is an integer number (1672026300).

Almost surely, 2^6686808881 is an apocalyptic number.

It is an amenable number.

6686808881 is a deficient number, since it is larger than the sum of its proper divisors (1296319).

6686808881 is a wasteful number, since it uses less digits than its factorization.

6686808881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296318.

The product of its (nonzero) digits is 7077888, while the sum is 59.

The square root of 6686808881 is about 81772.9104349356. The cubic root of 6686808881 is about 1883.9656069657.

The spelling of 6686808881 in words is "six billion, six hundred eighty-six million, eight hundred eight thousand, eight hundred eighty-one".