561055505 has 16 divisors (see below), whose sum is σ = 719939664. Its totient is φ = 418252800.

The previous prime is 561055499. The next prime is 561055519. The reversal of 561055505 is 505550165.

It can be written as a sum of positive squares in 8 ways, for example, as 175483009 + 385572496 = 13247^2 + 19636^2 .

It is not a de Polignac number, because 561055505 - 2²⁰ = 560006929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24092 + ... + 41261.

It is an arithmetic number, because the mean of its divisors is an integer number (44996229).

Almost surely, 2^561055505 is an apocalyptic number.

It is an amenable number.

561055505 is a deficient number, since it is larger than the sum of its proper divisors (158884159).

561055505 is a wasteful number, since it uses less digits than its factorization.

561055505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65476.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 561055505 is about 23686.6102471417. The cubic root of 561055505 is about 824.7745965178.

The spelling of 561055505 in words is "five hundred sixty-one million, fifty-five thousand, five hundred five".