561000505555 has 32 divisors (see below), whose sum is σ = 800608089600. Its totient is φ = 369371342592.

The previous prime is 561000505423. The next prime is 561000505591. The reversal of 561000505555 is 555505000165.

It is not a de Polignac number, because 561000505555 - 2¹¹ = 561000503507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3070170 + ... + 3247759.

It is an arithmetic number, because the mean of its divisors is an integer number (25019002800).

Almost surely, 2^561000505555 is an apocalyptic number.

561000505555 is a deficient number, since it is larger than the sum of its proper divisors (239607584045).

561000505555 is a wasteful number, since it uses less digits than its factorization.

561000505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318043.

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 561000505555 in words is "five hundred sixty-one billion, five hundred five thousand, five hundred fifty-five".