12540544533 has 24 divisors (see below), whose sum is σ = 19768600800. Its totient is φ = 7597352160.

The previous prime is 12540544531. The next prime is 12540544537. The reversal of 12540544533 is 33544504521.

12540544533 is a `hidden beast` number, since 1 + 25 + 40 + 544 + 53 + 3 = 666.

It is not a de Polignac number, because 12540544533 - 2¹ = 12540544531 is a prime.

It is a super-4 number, since 4×12540544533⁴ (a number of 41 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540544531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243735 + ... + 290667.

It is an arithmetic number, because the mean of its divisors is an integer number (823691700).

Almost surely, 2^12540544533 is an apocalyptic number.

It is an amenable number.

12540544533 is a deficient number, since it is larger than the sum of its proper divisors (7228056267).

12540544533 is a wasteful number, since it uses less digits than its factorization.

12540544533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49649 (or 49646 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 12540544533 in words is "twelve billion, five hundred forty million, five hundred forty-four thousand, five hundred thirty-three".