6686494816 has 12 divisors (see below), whose sum is σ = 13164036732. Its totient is φ = 3343247392.

The previous prime is 6686494783. The next prime is 6686494831. The reversal of 6686494816 is 6184946866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104476450 + ... + 104476513.

It is an arithmetic number, because the mean of its divisors is an integer number (1097003061).

Almost surely, 2^6686494816 is an apocalyptic number.

It is an amenable number.

6686494816 is a deficient number, since it is larger than the sum of its proper divisors (6477541916).

6686494816 is a wasteful number, since it uses less digits than its factorization.

6686494816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208952973 (or 208952965 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 58.

The square root of 6686494816 is about 81770.9900637139. The cubic root of 6686494816 is about 1883.9361112360.

The spelling of 6686494816 in words is "six billion, six hundred eighty-six million, four hundred ninety-four thousand, eight hundred sixteen".