505561650 has 96 divisors (see below), whose sum is σ = 1373269248. Its totient is φ = 122068800.

The previous prime is 505561649. The next prime is 505561663. The reversal of 505561650 is 56165505.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 572109 + ... + 572991.

It is an arithmetic number, because the mean of its divisors is an integer number (14304888).

Almost surely, 2^505561650 is an apocalyptic number.

505561650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 505561650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686634624).

505561650 is an abundant number, since it is smaller than the sum of its proper divisors (867707598).

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

505561650 is a wasteful number, since it uses less digits than its factorization.

505561650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 505561650 is about 22484.6981300617. The cubic root of 505561650 is about 796.6325378454.

The spelling of 505561650 in words is "five hundred five million, five hundred sixty-one thousand, six hundred fifty".