12531540045440 has 64 divisors (see below), whose sum is σ = 32262690859560. Its totient is φ = 4627030167552.

The previous prime is 12531540045359. The next prime is 12531540045467. The reversal of 12531540045440 is 4454004513521.

It can be written as a sum of positive squares in 4 ways, for example, as 6264288156736 + 6267251888704 = 2502856^2 + 2503448^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 12531540045394 and 12531540045403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753089039 + ... + 753105678.

Almost surely, 2^{12531540045440} is an apocalyptic number.

12531540045440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12531540045440 is an abundant number, since it is smaller than the sum of its proper divisors (19731150814120).

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

12531540045440 is a wasteful number, since it uses less digits than its factorization.

12531540045440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506194749 (or 1506194737 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 12531540045440 its reverse (4454004513521), we get a palindrome (16985544558961).

The spelling of 12531540045440 in words is "twelve trillion, five hundred thirty-one billion, five hundred forty million, forty-five thousand, four hundred forty".