6681213865 has 32 divisors (see below), whose sum is σ = 8764588800. Its totient is φ = 4869930240.

The previous prime is 6681213863. The next prime is 6681213871. The reversal of 6681213865 is 5683121866.

It is not a de Polignac number, because 6681213865 - 2¹ = 6681213863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6681213863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 719955 + ... + 729175.

It is an arithmetic number, because the mean of its divisors is an integer number (273893400).

Almost surely, 2^6681213865 is an apocalyptic number.

It is an amenable number.

6681213865 is a deficient number, since it is larger than the sum of its proper divisors (2083374935).

6681213865 is a wasteful number, since it uses less digits than its factorization.

6681213865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9537.

The product of its digits is 414720, while the sum is 46.

The square root of 6681213865 is about 81738.6925819101. The cubic root of 6681213865 is about 1883.4400070276.

The spelling of 6681213865 in words is "six billion, six hundred eighty-one million, two hundred thirteen thousand, eight hundred sixty-five".