561494913889 has 16 divisors (see below), whose sum is σ = 721117216512. Its totient is φ = 424944070848.

The previous prime is 561494913887. The next prime is 561494913923. The reversal of 561494913889 is 988319494165.

561494913889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 561494913889 - 2¹ = 561494913887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561494913887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134134294 + ... + 134138479.

It is an arithmetic number, because the mean of its divisors is an integer number (45069826032).

Almost surely, 2^561494913889 is an apocalyptic number.

It is an amenable number.

561494913889 is a deficient number, since it is larger than the sum of its proper divisors (159622302623).

561494913889 is a wasteful number, since it uses less digits than its factorization.

561494913889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268272816.

The product of its digits is 67184640, while the sum is 67.

The spelling of 561494913889 in words is "five hundred sixty-one billion, four hundred ninety-four million, nine hundred thirteen thousand, eight hundred eighty-nine".