561358020509 has 64 divisors (see below), whose sum is σ = 689632876800. Its totient is φ = 449913139200.

The previous prime is 561358020469. The next prime is 561358020523. The reversal of 561358020509 is 905020853165.

It is a cyclic number.

It is not a de Polignac number, because 561358020509 - 2¹⁶ = 561357954973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561358020509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561358020589) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 346302719 + ... + 346304339.

It is an arithmetic number, because the mean of its divisors is an integer number (10775513700).

Almost surely, 2^561358020509 is an apocalyptic number.

It is an amenable number.

561358020509 is a deficient number, since it is larger than the sum of its proper divisors (128274856291).

561358020509 is a wasteful number, since it uses less digits than its factorization.

561358020509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 561358020509 in words is "five hundred sixty-one billion, three hundred fifty-eight million, twenty thousand, five hundred nine".