505550550 has 96 divisors (see below), whose sum is σ = 1284016032. Its totient is φ = 131604480.

The previous prime is 505550543. The next prime is 505550561. The reversal of 505550550 is 55055505.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1499982 + ... + 1500318.

It is an arithmetic number, because the mean of its divisors is an integer number (13375167).

Almost surely, 2^505550550 is an apocalyptic number.

505550550 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 505550550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642008016).

505550550 is an abundant number, since it is smaller than the sum of its proper divisors (778465482).

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

505550550 is a wasteful number, since it uses less digits than its factorization.

505550550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 15625, while the sum is 30.

The square root of 505550550 is about 22484.4512941722. The cubic root of 505550550 is about 796.6267075733.

The spelling of 505550550 in words is "five hundred five million, five hundred fifty thousand, five hundred fifty".