505555550 has 48 divisors (see below), whose sum is σ = 979624800. Its totient is φ = 193872000.

The previous prime is 505555541. The next prime is 505555577. The reversal of 505555550 is 55555505.

It is a self number, because there is not a number n which added to its sum of digits gives 505555550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217796 + ... + 220104.

It is an arithmetic number, because the mean of its divisors is an integer number (20408850).

Almost surely, 2^505555550 is an apocalyptic number.

505555550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

505555550 is a deficient number, since it is larger than the sum of its proper divisors (474069250).

505555550 is a wasteful number, since it uses less digits than its factorization.

505555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501 (or 2496 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 35.

The square root of 505555550 is about 22484.5624818452. The cubic root of 505555550 is about 796.6293338325.

The spelling of 505555550 in words is "five hundred five million, five hundred fifty-five thousand, five hundred fifty".