505495566 has 40 divisors (see below), whose sum is σ = 1143116040. Its totient is φ = 166946832.

The previous prime is 505495553. The next prime is 505495567. The reversal of 505495566 is 665594505.

505495566 is a `hidden beast` number, since 50 + 5 + 49 + 556 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505495567) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3345 + ... + 31971.

It is an arithmetic number, because the mean of its divisors is an integer number (28577901).

Almost surely, 2^505495566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505495566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571558020).

505495566 is an abundant number, since it is smaller than the sum of its proper divisors (637620474).

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

505495566 is a wasteful number, since it uses less digits than its factorization.

505495566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28750 (or 28741 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 505495566 is about 22483.2285492987. The cubic root of 505495566 is about 796.5978259834.

The spelling of 505495566 in words is "five hundred five million, four hundred ninety-five thousand, five hundred sixty-six".