6551565666 has 8 divisors (see below), whose sum is σ = 13103131344. Its totient is φ = 2183855220.

The previous prime is 6551565661. The next prime is 6551565667. The reversal of 6551565666 is 6665651556.

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

6551565666 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6551565661) 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, 545963800 + ... + 545963811.

It is an arithmetic number, because the mean of its divisors is an integer number (1637891418).

Almost surely, 2^6551565666 is an apocalyptic number.

6551565666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6551565666 is a wasteful number, since it uses less digits than its factorization.

6551565666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091927616.

The product of its digits is 4860000, while the sum is 51.

The square root of 6551565666 is about 80941.7424200888. The cubic root of 6551565666 is about 1871.1776986704.

The spelling of 6551565666 in words is "six billion, five hundred fifty-one million, five hundred sixty-five thousand, six hundred sixty-six".