12012643640 has 32 divisors (see below), whose sum is σ = 27052920000. Its totient is φ = 4800706944.

The previous prime is 12012643637. The next prime is 12012643651. The reversal of 12012643640 is 4634621021.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 91040 + ... + 179759.

It is an arithmetic number, because the mean of its divisors is an integer number (845403750).

Almost surely, 2^12012643640 is an apocalyptic number.

12012643640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012643640 is an abundant number, since it is smaller than the sum of its proper divisors (15040276360).

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

12012643640 is a wasteful number, since it uses less digits than its factorization.

12012643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271919 (or 271915 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 12012643640 in words is "twelve billion, twelve million, six hundred forty-three thousand, six hundred forty".