12126561740 has 24 divisors (see below), whose sum is σ = 25699415280. Its totient is φ = 4806122688.

The previous prime is 12126561731. The next prime is 12126561749. The reversal of 12126561740 is 4716562121.

12126561740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12126561731) and next prime (12126561749).

It is a self number, because there is not a number n which added to its sum of digits gives 12126561740.

It is not an unprimeable number, because it can be changed into a prime (12126561749) 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, 2779142 + ... + 2783501.

It is an arithmetic number, because the mean of its divisors is an integer number (1070808970).

Almost surely, 2^12126561740 is an apocalyptic number.

12126561740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12126561740 is an abundant number, since it is smaller than the sum of its proper divisors (13572853540).

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

12126561740 is a wasteful number, since it uses less digits than its factorization.

12126561740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562761 (or 5562759 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 12126561740 in words is "twelve billion, one hundred twenty-six million, five hundred sixty-one thousand, seven hundred forty".