6686143215 has 32 divisors (see below), whose sum is σ = 10761977856. Its totient is φ = 3544611840.

The previous prime is 6686143207. The next prime is 6686143223. The reversal of 6686143215 is 5123416866.

It is an interprime number because it is at equal distance from previous prime (6686143207) and next prime (6686143223).

It is not a de Polignac number, because 6686143215 - 2³ = 6686143207 is a prime.

It is a super-2 number, since 2×6686143215² = 89409022182981072450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 3313887 + ... + 3315903.

It is an arithmetic number, because the mean of its divisors is an integer number (336311808).

Almost surely, 2^6686143215 is an apocalyptic number.

6686143215 is a deficient number, since it is larger than the sum of its proper divisors (4075834641).

6686143215 is a wasteful number, since it uses less digits than its factorization.

6686143215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239.

The product of its digits is 207360, while the sum is 42.

The square root of 6686143215 is about 81768.8401226286. The cubic root of 6686143215 is about 1883.9030891794.

The spelling of 6686143215 in words is "six billion, six hundred eighty-six million, one hundred forty-three thousand, two hundred fifteen".