12540424144 has 20 divisors (see below), whose sum is σ = 24340245696. Its totient is φ = 6259070432.

The previous prime is 12540424129. The next prime is 12540424147. The reversal of 12540424144 is 44142404521.

It is a super-2 number, since 2×12540424144² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540424147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687064 + ... + 705079.

Almost surely, 2^12540424144 is an apocalyptic number.

It is an amenable number.

12540424144 is a deficient number, since it is larger than the sum of its proper divisors (11799821552).

12540424144 is a wasteful number, since it uses less digits than its factorization.

12540424144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392714 (or 1392708 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 12540424144 its reverse (44142404521), we get a palindrome (56682828665).

The spelling of 12540424144 in words is "twelve billion, five hundred forty million, four hundred twenty-four thousand, one hundred forty-four".