561718771441 has 9 divisors (see below), whose sum is σ = 596718250699. Its totient is φ = 528664499104.

The previous prime is 561718771357. The next prime is 561718771447. The reversal of 561718771441 is 144177817165.

The square root of 561718771441 is 749479.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 437324303025 + 124394468416 = 661305^2 + 352696^2 .

It is not a de Polignac number, because 561718771441 - 2¹⁵ = 561718738673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561718771447) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12719100 + ... + 12763186.

Almost surely, 2^561718771441 is an apocalyptic number.

561718771441 is the 749479-th square number.

561718771441 is the 374740-th centered octagonal number.

It is an amenable number.

561718771441 is a deficient number, since it is larger than the sum of its proper divisors (34999479258).

561718771441 is an frugal number, since it uses more digits than its factorization.

561718771441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88208 (or 44104 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 52.

The spelling of 561718771441 in words is "five hundred sixty-one billion, seven hundred eighteen million, seven hundred seventy-one thousand, four hundred forty-one".