561563055 has 48 divisors (see below), whose sum is σ = 1019977920. Its totient is φ = 285272064.

The previous prime is 561563027. The next prime is 561563081. The reversal of 561563055 is 550365165.

561563055 is a `hidden beast` number, since 5 + 6 + 15 + 630 + 5 + 5 = 666.

It is not a de Polignac number, because 561563055 - 2¹⁰ = 561562031 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277407 + ... + 279423.

It is an arithmetic number, because the mean of its divisors is an integer number (21249540).

Almost surely, 2^561563055 is an apocalyptic number.

561563055 is a deficient number, since it is larger than the sum of its proper divisors (458414865).

561563055 is a wasteful number, since it uses less digits than its factorization.

561563055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The square root of 561563055 is about 23697.3216841060. The cubic root of 561563055 is about 825.0232279961.

The spelling of 561563055 in words is "five hundred sixty-one million, five hundred sixty-three thousand, fifty-five".