12531043440 has 140 divisors (see below), whose sum is σ = 43682234664. Its totient is φ = 3341596032.

The previous prime is 12531043429. The next prime is 12531043501. The reversal of 12531043440 is 4434013521.

It is a happy number.

12531043440 is a `hidden beast` number, since 1 + 2 + 5 + 310 + 4 + 344 + 0 = 666.

12531043440 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 49114 + ... + 165753.

Almost surely, 2^12531043440 is an apocalyptic number.

12531043440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12531043440 is an abundant number, since it is smaller than the sum of its proper divisors (31151191224).

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

12531043440 is an equidigital number, since it uses as much as digits as its factorization.

12531043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214898 (or 214877 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 12531043440 its reverse (4434013521), we get a palindrome (16965056961).

The spelling of 12531043440 in words is "twelve billion, five hundred thirty-one million, forty-three thousand, four hundred forty".