12505665136 has 40 divisors (see below), whose sum is σ = 24400759680. Its totient is φ = 6208767936.

The previous prime is 12505665131. The next prime is 12505665149. The reversal of 12505665136 is 63156650521.

12505665136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505665131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5160021 + ... + 5162443.

It is an arithmetic number, because the mean of its divisors is an integer number (610018992).

Almost surely, 2^12505665136 is an apocalyptic number.

12505665136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12505665136 is a deficient number, since it is larger than the sum of its proper divisors (11895094544).

12505665136 is a wasteful number, since it uses less digits than its factorization.

12505665136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573 (or 4567 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 12505665136 in words is "twelve billion, five hundred five million, six hundred sixty-five thousand, one hundred thirty-six".