6551666120 has 16 divisors (see below), whose sum is σ = 14741248860. Its totient is φ = 2620666432.

The previous prime is 6551666119. The next prime is 6551666129. The reversal of 6551666120 is 216661556.

It can be written as a sum of positive squares in 2 ways, for example, as 6442630756 + 109035364 = 80266^2 + 10442^2 .

It is not an unprimeable number, because it can be changed into a prime (6551666129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81895787 + ... + 81895866.

Almost surely, 2^6551666120 is an apocalyptic number.

It is an amenable number.

6551666120 is an abundant number, since it is smaller than the sum of its proper divisors (8189582740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6551666120 is a wasteful number, since it uses less digits than its factorization.

6551666120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163791664 (or 163791660 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 6551666120 is about 80942.3629504353. The cubic root of 6551666120 is about 1871.1872621006.

The spelling of 6551666120 in words is "six billion, five hundred fifty-one million, six hundred sixty-six thousand, one hundred twenty".