6685817966 has 8 divisors (see below), whose sum is σ = 10029107664. Its totient is φ = 3342782080.

The previous prime is 6685817947. The next prime is 6685818037. The reversal of 6685817966 is 6697185866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6685817899 and 6685817908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29831 + ... + 119421.

It is an arithmetic number, because the mean of its divisors is an integer number (1253638458).

Almost surely, 2^6685817966 is an apocalyptic number.

6685817966 is a deficient number, since it is larger than the sum of its proper divisors (3343289698).

6685817966 is a wasteful number, since it uses less digits than its factorization.

6685817966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126906.

The product of its digits is 26127360, while the sum is 62.

The square root of 6685817966 is about 81766.8512662680. The cubic root of 6685817966 is about 1883.8725410486.

The spelling of 6685817966 in words is "six billion, six hundred eighty-five million, eight hundred seventeen thousand, nine hundred sixty-six".