561722783881 has 4 divisors (see below), whose sum is σ = 641968895872. Its totient is φ = 481476671892.

The previous prime is 561722783879. The next prime is 561722783891. The reversal of 561722783881 is 188387227165.

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 561722783881 - 2¹ = 561722783879 is a prime.

It is a super-2 number, since 2×561722783881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561722783891) 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, 40123055985 + ... + 40123055998.

It is an arithmetic number, because the mean of its divisors is an integer number (160492223968).

Almost surely, 2^561722783881 is an apocalyptic number.

It is an amenable number.

561722783881 is a deficient number, since it is larger than the sum of its proper divisors (80246111991).

561722783881 is an equidigital number, since it uses as much as digits as its factorization.

561722783881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80246111990.

The product of its digits is 9031680, while the sum is 58.

The spelling of 561722783881 in words is "five hundred sixty-one billion, seven hundred twenty-two million, seven hundred eighty-three thousand, eight hundred eighty-one".