505505005551 has 48 divisors (see below), whose sum is σ = 926782974720. Its totient is φ = 266639986080.

The previous prime is 505505005541. The next prime is 505505005553. The reversal of 505505005551 is 155500505505.

It is a happy number.

505505005551 is a `hidden beast` number, since 5 + 0 + 5 + 50 + 50 + 0 + 5 + 551 = 666.

It is not a de Polignac number, because 505505005551 - 2⁶ = 505505005487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505505005553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7881165 + ... + 7945046.

It is an arithmetic number, because the mean of its divisors is an integer number (19307978640).

Almost surely, 2^505505005551 is an apocalyptic number.

505505005551 is a deficient number, since it is larger than the sum of its proper divisors (421277969169).

505505005551 is a wasteful number, since it uses less digits than its factorization.

505505005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15826253 (or 15826234 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 36.

The spelling of 505505005551 in words is "five hundred five billion, five hundred five million, five thousand, five hundred fifty-one".