505550556 has 144 divisors (see below), whose sum is σ = 1628040960. Its totient is φ = 128770560.

The previous prime is 505550543. The next prime is 505550561. The reversal of 505550556 is 655055505.

505550556 is a `hidden beast` number, since 5 + 0 + 55 + 50 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 505550556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78291 + ... + 84501.

It is an arithmetic number, because the mean of its divisors is an integer number (11305840).

Almost surely, 2^505550556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505550556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814020480).

505550556 is an abundant number, since it is smaller than the sum of its proper divisors (1122490404).

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

505550556 is a wasteful number, since it uses less digits than its factorization.

505550556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6264 (or 6259 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 36.

The square root of 505550556 is about 22484.4514275977. The cubic root of 505550556 is about 796.6267107248.

It can be divided in two parts, 5055 and 50556, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 505550556 in words is "five hundred five million, five hundred fifty thousand, five hundred fifty-six".