12544840561 has 16 divisors (see below), whose sum is σ = 14502499200. Its totient is φ = 10742569600.

The previous prime is 12544840543. The next prime is 12544840571. The reversal of 12544840561 is 16504844521.

It is a cyclic number.

It is not a de Polignac number, because 12544840561 - 2⁷ = 12544840433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12544840501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466501 + ... + 492658.

It is an arithmetic number, because the mean of its divisors is an integer number (906406200).

Almost surely, 2^12544840561 is an apocalyptic number.

12544840561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12544840561 is a deficient number, since it is larger than the sum of its proper divisors (1957658639).

12544840561 is a wasteful number, since it uses less digits than its factorization.

12544840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959240.

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 12544840561 in words is "twelve billion, five hundred forty-four million, eight hundred forty thousand, five hundred sixty-one".