505550505551 has 16 divisors (see below), whose sum is σ = 629207208000. Its totient is φ = 395501660928.

The previous prime is 505550505533. The next prime is 505550505553. The reversal of 505550505551 is 155505055505.

It is a cyclic number.

It is not a de Polignac number, because 505550505551 - 2⁶ = 505550505487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505550505499 and 505550505508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505550505553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31202576 + ... + 31218773.

It is an arithmetic number, because the mean of its divisors is an integer number (39325450500).

Almost surely, 2^505550505551 is an apocalyptic number.

505550505551 is a deficient number, since it is larger than the sum of its proper divisors (123656702449).

505550505551 is a wasteful number, since it uses less digits than its factorization.

505550505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62421458.

The product of its (nonzero) digits is 390625, while the sum is 41.

It can be divided in two parts, 505550 and 505551, that added together give a palindrome (1011101).

The spelling of 505550505551 in words is "five hundred five billion, five hundred fifty million, five hundred five thousand, five hundred fifty-one".