561605555503 has 4 divisors (see below), whose sum is σ = 561607086640. Its totient is φ = 561604024368.

The previous prime is 561605555501. The next prime is 561605555551. The reversal of 561605555503 is 305555506165.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 561605555503 - 2¹ = 561605555501 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 (561605555501) 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, 148051 + ... + 1070107.

It is an arithmetic number, because the mean of its divisors is an integer number (140401771660).

Almost surely, 2^561605555503 is an apocalyptic number.

561605555503 is a deficient number, since it is larger than the sum of its proper divisors (1531137).

561605555503 is an equidigital number, since it uses as much as digits as its factorization.

561605555503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531136.

The product of its (nonzero) digits is 1687500, while the sum is 46.

The spelling of 561605555503 in words is "five hundred sixty-one billion, six hundred five million, five hundred fifty-five thousand, five hundred three".