6686477906 has 16 divisors (see below), whose sum is σ = 10293307200. Its totient is φ = 3256415568.

The previous prime is 6686477899. The next prime is 6686477921. The reversal of 6686477906 is 6097746866.

It is a super-2 number, since 2×6686477906² = 89417973574852289672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247070 + ... + 272793.

It is an arithmetic number, because the mean of its divisors is an integer number (643331700).

Almost surely, 2^6686477906 is an apocalyptic number.

6686477906 is a deficient number, since it is larger than the sum of its proper divisors (3606829294).

6686477906 is a wasteful number, since it uses less digits than its factorization.

6686477906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520033.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The square root of 6686477906 is about 81770.8866651206. The cubic root of 6686477906 is about 1883.9345230902.

The spelling of 6686477906 in words is "six billion, six hundred eighty-six million, four hundred seventy-seven thousand, nine hundred six".