12538557581344 has 24 divisors (see below), whose sum is σ = 24865469810748. Its totient is φ = 6223517629440.

The previous prime is 12538557581311. The next prime is 12538557581357. The reversal of 12538557581344 is 44318575583521.

It can be written as a sum of positive squares in 2 ways, for example, as 11107155907600 + 1431401673744 = 3332740^2 + 1196412^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430031837 + ... + 1430040604.

Almost surely, 2^{12538557581344} is an apocalyptic number.

It is an amenable number.

12538557581344 is a deficient number, since it is larger than the sum of its proper divisors (12326912229404).

12538557581344 is a wasteful number, since it uses less digits than its factorization.

12538557581344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860072588 (or 2860072580 counting only the distinct ones).

The product of its digits is 80640000, while the sum is 61.

The spelling of 12538557581344 in words is "twelve trillion, five hundred thirty-eight billion, five hundred fifty-seven million, five hundred eighty-one thousand, three hundred forty-four".