6687356856 has 64 divisors (see below), whose sum is σ = 16823116800. Its totient is φ = 2215200000.

The previous prime is 6687356843. The next prime is 6687356857. The reversal of 6687356856 is 6586537866.

It is a self number, because there is not a number n which added to its sum of digits gives 6687356856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687356857) 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 15 ways as a sum of consecutive naturals, for example, 3426681 + ... + 3428631.

It is an arithmetic number, because the mean of its divisors is an integer number (262861200).

Almost surely, 2^6687356856 is an apocalyptic number.

It is an amenable number.

6687356856 is an abundant number, since it is smaller than the sum of its proper divisors (10135759944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687356856 is a wasteful number, since it uses less digits than its factorization.

6687356856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780 (or 2776 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 60.

The square root of 6687356856 is about 81776.2609563436. The cubic root of 6687356856 is about 1884.0170683764.

The spelling of 6687356856 in words is "six billion, six hundred eighty-seven million, three hundred fifty-six thousand, eight hundred fifty-six".