12561105112 has 32 divisors (see below), whose sum is σ = 25081682400. Its totient is φ = 5876929024.

The previous prime is 12561105101. The next prime is 12561105121. The reversal of 12561105112 is 21150116521.

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, 243412 + ... + 290467.

It is an arithmetic number, because the mean of its divisors is an integer number (783802575).

Almost surely, 2^12561105112 is an apocalyptic number.

It is an amenable number.

12561105112 is a deficient number, since it is larger than the sum of its proper divisors (12520577288).

12561105112 is a wasteful number, since it uses less digits than its factorization.

12561105112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534075 (or 534071 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 25.

The spelling of 12561105112 in words is "twelve billion, five hundred sixty-one million, one hundred five thousand, one hundred twelve".