12561544332 has 18 divisors (see below), whose sum is σ = 31752792708. Its totient is φ = 4187181432.

The previous prime is 12561544301. The next prime is 12561544337. The reversal of 12561544332 is 23344516521.

12561544332 is a `hidden beast` number, since 1 + 2 + 5 + 615 + 4 + 4 + 3 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 348931787 = 12561544332 / (1 + 2 + 5 + 6 + 1 + 5 + 4 + 4 + 3 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (12561544337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 174465858 + ... + 174465929.

Almost surely, 2^12561544332 is an apocalyptic number.

12561544332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12561544332 is an abundant number, since it is smaller than the sum of its proper divisors (19191248376).

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

12561544332 is a wasteful number, since it uses less digits than its factorization.

12561544332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348931797 (or 348931792 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 12561544332 in words is "twelve billion, five hundred sixty-one million, five hundred forty-four thousand, three hundred thirty-two".