12747487581 has 24 divisors (see below), whose sum is σ = 19426012320. Its totient is φ = 8032823136.

The previous prime is 12747487579. The next prime is 12747487589. The reversal of 12747487581 is 18578474721.

It is a happy number.

12747487581 is a `hidden beast` number, since 1 + 27 + 474 + 8 + 75 + 81 = 666.

It is not a de Polignac number, because 12747487581 - 2¹ = 12747487579 is a prime.

It is a super-2 number, since 2×12747487581² (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 (12747487589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8386 + ... + 159891.

It is an arithmetic number, because the mean of its divisors is an integer number (809417180).

Almost surely, 2^12747487581 is an apocalyptic number.

It is an amenable number.

12747487581 is a deficient number, since it is larger than the sum of its proper divisors (6678524739).

12747487581 is a wasteful number, since it uses less digits than its factorization.

12747487581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168745 (or 168742 counting only the distinct ones).

The product of its digits is 3512320, while the sum is 54.

The spelling of 12747487581 in words is "twelve billion, seven hundred forty-seven million, four hundred eighty-seven thousand, five hundred eighty-one".