505565557 has 4 divisors (see below), whose sum is σ = 577789216. Its totient is φ = 433341900.

The previous prime is 505565551. The next prime is 505565561. The reversal of 505565557 is 755565505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505565557 - 2⁷ = 505565429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505565551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36111819 + ... + 36111832.

It is an arithmetic number, because the mean of its divisors is an integer number (144447304).

Almost surely, 2^505565557 is an apocalyptic number.

It is an amenable number.

505565557 is a deficient number, since it is larger than the sum of its proper divisors (72223659).

505565557 is an equidigital number, since it uses as much as digits as its factorization.

505565557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72223658.

The product of its (nonzero) digits is 656250, while the sum is 43.

The square root of 505565557 is about 22484.7850112026. The cubic root of 505565557 is about 796.6345899758.

The spelling of 505565557 in words is "five hundred five million, five hundred sixty-five thousand, five hundred fifty-seven".