561111728388 has 12 divisors (see below), whose sum is σ = 1309260699600. Its totient is φ = 187037242792.

The previous prime is 561111728279. The next prime is 561111728417. The reversal of 561111728388 is 883827111165.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 561111728388.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23379655338 + ... + 23379655361.

It is an arithmetic number, because the mean of its divisors is an integer number (109105058300).

Almost surely, 2^561111728388 is an apocalyptic number.

It is an amenable number.

561111728388 is an abundant number, since it is smaller than the sum of its proper divisors (748148971212).

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

561111728388 is a wasteful number, since it uses less digits than its factorization.

561111728388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46759310706 (or 46759310704 counting only the distinct ones).

The product of its digits is 645120, while the sum is 51.

The spelling of 561111728388 in words is "five hundred sixty-one billion, one hundred eleven million, seven hundred twenty-eight thousand, three hundred eighty-eight".