561055506 has 16 divisors (see below), whose sum is σ = 1224121248. Its totient is φ = 170016800.

The previous prime is 561055499. The next prime is 561055519. The reversal of 561055506 is 605550165.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 4250355 + ... + 4250486.

It is an arithmetic number, because the mean of its divisors is an integer number (76507578).

Almost surely, 2^561055506 is an apocalyptic number.

561055506 is an abundant number, since it is smaller than the sum of its proper divisors (663065742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561055506 is a wasteful number, since it uses less digits than its factorization.

561055506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500857.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 561055506 is about 23686.6102682507. The cubic root of 561055506 is about 824.7745970078.

It can be divided in two parts, 5610 and 55506, that added together give a palindrome (61116).

The spelling of 561055506 in words is "five hundred sixty-one million, fifty-five thousand, five hundred six".