561581365889 has 4 divisors (see below), whose sum is σ = 561651422724. Its totient is φ = 561511309056.

The previous prime is 561581365859. The next prime is 561581365897. The reversal of 561581365889 is 988563185165.

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 416883292225 + 144698073664 = 645665^2 + 380392^2 .

It is a cyclic number.

It is not a de Polignac number, because 561581365889 - 2¹⁶ = 561581300353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561581365859) 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, 35016392 + ... + 35032425.

It is an arithmetic number, because the mean of its divisors is an integer number (140412855681).

Almost surely, 2^561581365889 is an apocalyptic number.

It is an amenable number.

561581365889 is a deficient number, since it is larger than the sum of its proper divisors (70056835).

561581365889 is an equidigital number, since it uses as much as digits as its factorization.

561581365889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70056834.

The product of its digits is 62208000, while the sum is 65.

The spelling of 561581365889 in words is "five hundred sixty-one billion, five hundred eighty-one million, three hundred sixty-five thousand, eight hundred eighty-nine".