12509965540 has 12 divisors (see below), whose sum is σ = 26270927676. Its totient is φ = 5003986208.

The previous prime is 12509965537. The next prime is 12509965547. The reversal of 12509965540 is 4556990521.

It can be written as a sum of positive squares in 2 ways, for example, as 8441566884 + 4068398656 = 91878^2 + 63784^2 .

It is not an unprimeable number, because it can be changed into a prime (12509965547) 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 3 ways as a sum of consecutive naturals, for example, 312749119 + ... + 312749158.

It is an arithmetic number, because the mean of its divisors is an integer number (2189243973).

Almost surely, 2^12509965540 is an apocalyptic number.

12509965540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12509965540 is an abundant number, since it is smaller than the sum of its proper divisors (13760962136).

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

12509965540 is a wasteful number, since it uses less digits than its factorization.

12509965540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625498286 (or 625498284 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 12509965540 in words is "twelve billion, five hundred nine million, nine hundred sixty-five thousand, five hundred forty".