6647256685 has 32 divisors (see below), whose sum is σ = 8679859200. Its totient is φ = 4868398080.

The previous prime is 6647256673. The next prime is 6647256697. The reversal of 6647256685 is 5866527466.

It is an interprime number because it is at equal distance from previous prime (6647256673) and next prime (6647256697).

It is not a de Polignac number, because 6647256685 - 2¹¹ = 6647254637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2970387 + ... + 2972623.

It is an arithmetic number, because the mean of its divisors is an integer number (271245600).

Almost surely, 2^6647256685 is an apocalyptic number.

It is an amenable number.

6647256685 is a deficient number, since it is larger than the sum of its proper divisors (2032602515).

6647256685 is a wasteful number, since it uses less digits than its factorization.

6647256685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301.

The product of its digits is 14515200, while the sum is 55.

The square root of 6647256685 is about 81530.7100729535. The cubic root of 6647256685 is about 1880.2437330180.

The spelling of 6647256685 in words is "six billion, six hundred forty-seven million, two hundred fifty-six thousand, six hundred eighty-five".