561211356643 has 8 divisors (see below), whose sum is σ = 641460657920. Its totient is φ = 480981117960.

The previous prime is 561211356593. The next prime is 561211356647. The reversal of 561211356643 is 346653112165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561211356643 - 2¹⁷ = 561211225571 is a prime.

It is a super-3 number, since 3×561211356643³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561211356643.

It is not an unprimeable number, because it can be changed into a prime (561211356647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4702503 + ... + 4820368.

It is an arithmetic number, because the mean of its divisors is an integer number (80182582240).

Almost surely, 2^561211356643 is an apocalyptic number.

561211356643 is a deficient number, since it is larger than the sum of its proper divisors (80249301277).

561211356643 is an equidigital number, since it uses as much as digits as its factorization.

561211356643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531297.

The product of its digits is 388800, while the sum is 43.

The spelling of 561211356643 in words is "five hundred sixty-one billion, two hundred eleven million, three hundred fifty-six thousand, six hundred forty-three".