505505553 has 16 divisors (see below), whose sum is σ = 781793280. Its totient is φ = 284548176.

The previous prime is 505505537. The next prime is 505505579. The reversal of 505505553 is 355505505.

It is not a de Polignac number, because 505505553 - 2⁴ = 505505537 is a prime.

It is a super-2 number, since 2×505505553² = 511071728227671618, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505505153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178233 + ... + 181046.

It is an arithmetic number, because the mean of its divisors is an integer number (48862080).

Almost surely, 2^505505553 is an apocalyptic number.

It is an amenable number.

505505553 is a deficient number, since it is larger than the sum of its proper divisors (276287727).

505505553 is a wasteful number, since it uses less digits than its factorization.

505505553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359356.

The product of its (nonzero) digits is 46875, while the sum is 33.

The square root of 505505553 is about 22483.4506470871. The cubic root of 505505553 is about 796.6030720367.

The spelling of 505505553 in words is "five hundred five million, five hundred five thousand, five hundred fifty-three".