6687447866 has 32 divisors (see below), whose sum is σ = 11195573760. Its totient is φ = 2970238000.

The previous prime is 6687447857. The next prime is 6687447911.

6687447866 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×6687447866³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6687447799 and 6687447808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201341 + ... + 232191.

It is an arithmetic number, because the mean of its divisors is an integer number (349861680).

Almost surely, 2^6687447866 is an apocalyptic number.

6687447866 is a deficient number, since it is larger than the sum of its proper divisors (4508125894).

6687447866 is a wasteful number, since it uses less digits than its factorization.

6687447866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31090.

The product of its digits is 65028096, while the sum is 62.

The square root of 6687447866 is about 81776.8174117824. The cubic root of 6687447866 is about 1884.0256150324.

The spelling of 6687447866 in words is "six billion, six hundred eighty-seven million, four hundred forty-seven thousand, eight hundred sixty-six".