6521685868 has 12 divisors (see below), whose sum is σ = 11413552752. Its totient is φ = 3260670800.

The previous prime is 6521685829. The next prime is 6521685883. The reversal of 6521685868 is 8685861256.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83646 + ... + 141562.

It is an arithmetic number, because the mean of its divisors is an integer number (951129396).

Almost surely, 2^6521685868 is an apocalyptic number.

It is an amenable number.

6521685868 is a deficient number, since it is larger than the sum of its proper divisors (4891866884).

6521685868 is a wasteful number, since it uses less digits than its factorization.

6521685868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86072 (or 86070 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 55.

The square root of 6521685868 is about 80756.9555394456. The cubic root of 6521685868 is about 1868.3287295533.

The spelling of 6521685868 in words is "six billion, five hundred twenty-one million, six hundred eighty-five thousand, eight hundred sixty-eight".