505561066366 has 4 divisors (see below), whose sum is σ = 758341599552. Its totient is φ = 252780533182.

The previous prime is 505561066357. The next prime is 505561066391. The reversal of 505561066366 is 663660165505.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126390266590 + ... + 126390266593.

It is an arithmetic number, because the mean of its divisors is an integer number (189585399888).

Almost surely, 2^505561066366 is an apocalyptic number.

505561066366 is a deficient number, since it is larger than the sum of its proper divisors (252780533186).

505561066366 is a wasteful number, since it uses less digits than its factorization.

505561066366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252780533185.

The product of its (nonzero) digits is 2916000, while the sum is 49.

The spelling of 505561066366 in words is "five hundred five billion, five hundred sixty-one million, sixty-six thousand, three hundred sixty-six".