505561066 has 4 divisors (see below), whose sum is σ = 758341602. Its totient is φ = 252780532.

The previous prime is 505561061. The next prime is 505561073. The reversal of 505561066 is 660165505.

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

It can be written as a sum of positive squares in only one way, i.e., 491908041 + 13653025 = 22179^2 + 3695^2 .

It is not an unprimeable number, because it can be changed into a prime (505561061) 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 as a sum of consecutive naturals, namely, 126390265 + ... + 126390268.

Almost surely, 2^505561066 is an apocalyptic number.

505561066 is a deficient number, since it is larger than the sum of its proper divisors (252780536).

505561066 is a wasteful number, since it uses less digits than its factorization.

505561066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252780535.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 505561066 is about 22484.6851434482. The cubic root of 505561066 is about 796.6322311016.

The spelling of 505561066 in words is "five hundred five million, five hundred sixty-one thousand, sixty-six".