561405455220 has 24 divisors (see below), whose sum is σ = 1571935274784. Its totient is φ = 149708121376.

The previous prime is 561405455189. The next prime is 561405455231. The reversal of 561405455220 is 22554504165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4678378734 + ... + 4678378853.

It is an arithmetic number, because the mean of its divisors is an integer number (65497303116).

Almost surely, 2^561405455220 is an apocalyptic number.

It is an amenable number.

561405455220 is an abundant number, since it is smaller than the sum of its proper divisors (1010529819564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561405455220 is a wasteful number, since it uses less digits than its factorization.

561405455220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9356757599 (or 9356757597 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 561405455220 its reverse (22554504165), we get a palindrome (583959959385).

The spelling of 561405455220 in words is "five hundred sixty-one billion, four hundred five million, four hundred fifty-five thousand, two hundred twenty".