12561456384 has 108 divisors (see below), whose sum is σ = 36654692256. Its totient is φ = 4136641536.

The previous prime is 12561456373. The next prime is 12561456409. The reversal of 12561456384 is 48365416521.

12561456384 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 1 + 4 + 5 + 638 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158389 + ... + 224075.

Almost surely, 2^12561456384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12561456384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18327346128).

12561456384 is an abundant number, since it is smaller than the sum of its proper divisors (24093235872).

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

12561456384 is an equidigital number, since it uses as much as digits as its factorization.

12561456384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65792 (or 65775 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 12561456384 in words is "twelve billion, five hundred sixty-one million, four hundred fifty-six thousand, three hundred eighty-four".