505550611666 has 8 divisors (see below), whose sum is σ = 760438247040. Its totient is φ = 252071195988.

The previous prime is 505550611663. The next prime is 505550611673. The reversal of 505550611666 is 666116055505.

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

It is not an unprimeable number, because it can be changed into a prime (505550611661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352054026 + ... + 352055461.

It is an arithmetic number, because the mean of its divisors is an integer number (95054780880).

Almost surely, 2^505550611666 is an apocalyptic number.

505550611666 is a deficient number, since it is larger than the sum of its proper divisors (254887635374).

505550611666 is a wasteful number, since it uses less digits than its factorization.

505550611666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704109848.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 505550611666 in words is "five hundred five billion, five hundred fifty million, six hundred eleven thousand, six hundred sixty-six".