6806217556 has 12 divisors (see below), whose sum is σ = 11955160980. Its totient is φ = 3390457280.

The previous prime is 6806217503. The next prime is 6806217559. The reversal of 6806217556 is 6557126086.

It can be written as a sum of positive squares in 2 ways, for example, as 4234104900 + 2572112656 = 65070^2 + 50716^2 .

It is a super-2 number, since 2×6806217556² = 92649194839205226272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6806217559) by changing a digit.

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, 3161665 + ... + 3163816.

It is an arithmetic number, because the mean of its divisors is an integer number (996263415).

Almost surely, 2^6806217556 is an apocalyptic number.

It is an amenable number.

6806217556 is a deficient number, since it is larger than the sum of its proper divisors (5148943424).

6806217556 is a wasteful number, since it uses less digits than its factorization.

6806217556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325754 (or 6325752 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 6806217556 is about 82499.8033694626. The cubic root of 6806217556 is about 1895.1137193865.

The spelling of 6806217556 in words is "six billion, eight hundred six million, two hundred seventeen thousand, five hundred fifty-six".