12605063440 has 80 divisors (see below), whose sum is σ = 32100824880. Its totient is φ = 4581785600.

The previous prime is 12605063431. The next prime is 12605063441. The reversal of 12605063440 is 4436050621.

It can be written as a sum of positive squares in 8 ways, for example, as 97772544 + 12507290896 = 9888^2 + 111836^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (12605063441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120361 + ... + 199240.

It is an arithmetic number, because the mean of its divisors is an integer number (401260311).

Almost surely, 2^12605063440 is an apocalyptic number.

12605063440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12605063440 is an abundant number, since it is smaller than the sum of its proper divisors (19495761440).

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

12605063440 is a wasteful number, since it uses less digits than its factorization.

12605063440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319660 (or 319654 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 12605063440 in words is "twelve billion, six hundred five million, sixty-three thousand, four hundred forty".