505561105550 has 12 divisors (see below), whose sum is σ = 940343656416. Its totient is φ = 202224442200.

The previous prime is 505561105519. The next prime is 505561105561. The reversal of 505561105550 is 55501165505.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5055611006 + ... + 5055611105.

It is an arithmetic number, because the mean of its divisors is an integer number (78361971368).

Almost surely, 2^505561105550 is an apocalyptic number.

505561105550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

505561105550 is a deficient number, since it is larger than the sum of its proper divisors (434782550866).

505561105550 is a wasteful number, since it uses less digits than its factorization.

505561105550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111222123 (or 10111222118 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 505561105550 in words is "five hundred five billion, five hundred sixty-one million, one hundred five thousand, five hundred fifty".