13561064640441 has 6 divisors (see below), whose sum is σ = 19588204480650. Its totient is φ = 9040709760288.

The previous prime is 13561064640439. The next prime is 13561064640491. The reversal of 13561064640441 is 14404646016531.

13561064640441 is a `hidden beast` number, since 1 + 3 + 561 + 0 + 6 + 4 + 6 + 40 + 4 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12968209299600 + 592855340841 = 3601140^2 + 769971^2 .

It is not a de Polignac number, because 13561064640441 - 2¹ = 13561064640439 is a prime.

It is a super-2 number, since 2×13561064640441² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13561064640491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 753392480016 + ... + 753392480033.

It is an arithmetic number, because the mean of its divisors is an integer number (3264700746775).

Almost surely, 2^{13561064640441} is an apocalyptic number.

It is an amenable number.

13561064640441 is a deficient number, since it is larger than the sum of its proper divisors (6027139840209).

13561064640441 is a wasteful number, since it uses less digits than its factorization.

13561064640441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506784960055 (or 1506784960052 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 13561064640441 in words is "thirteen trillion, five hundred sixty-one billion, sixty-four million, six hundred forty thousand, four hundred forty-one".