561318223235573 has 4 divisors (see below), whose sum is σ = 561320904290988. Its totient is φ = 561315542180160.

The previous prime is 561318223235531. The next prime is 561318223235579. The reversal of 561318223235573 is 375532322813165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157233367368529 + 404084855867044 = 12539273^2 + 20101862^2 .

It is a cyclic number.

It is not a de Polignac number, because 561318223235573 - 2⁶ = 561318223235509 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 (561318223235579) 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, 1340213636 + ... + 1340632397.

It is an arithmetic number, because the mean of its divisors is an integer number (140330226072747).

Almost surely, 2^{561318223235573} is an apocalyptic number.

It is an amenable number.

561318223235573 is a deficient number, since it is larger than the sum of its proper divisors (2681055415).

561318223235573 is a wasteful number, since it uses less digits than its factorization.

561318223235573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681055414.

The product of its digits is 27216000, while the sum is 56.

The spelling of 561318223235573 in words is "five hundred sixty-one trillion, three hundred eighteen billion, two hundred twenty-three million, two hundred thirty-five thousand, five hundred seventy-three".