561111055601 has 4 divisors (see below), whose sum is σ = 562312578672. Its totient is φ = 559909532532.

The previous prime is 561111055471. The next prime is 561111055607. The reversal of 561111055601 is 106550111165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561111055601 - 2¹⁰ = 561111054577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561111055607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600760835 + ... + 600761768.

It is an arithmetic number, because the mean of its divisors is an integer number (140578144668).

Almost surely, 2^561111055601 is an apocalyptic number.

It is an amenable number.

561111055601 is a deficient number, since it is larger than the sum of its proper divisors (1201523071).

561111055601 is a wasteful number, since it uses less digits than its factorization.

561111055601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201523070.

The product of its (nonzero) digits is 4500, while the sum is 32.

Adding to 561111055601 its reverse (106550111165), we get a palindrome (667661166766).

The spelling of 561111055601 in words is "five hundred sixty-one billion, one hundred eleven million, fifty-five thousand, six hundred one".