12549657543 has 16 divisors (see below), whose sum is σ = 17182995456. Its totient is φ = 8142765120.

The previous prime is 12549657539. The next prime is 12549657559. The reversal of 12549657543 is 34575694521.

It is not a de Polignac number, because 12549657543 - 2² = 12549657539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12549657143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136855 + ... + 209352.

It is an arithmetic number, because the mean of its divisors is an integer number (1073937216).

Almost surely, 2^12549657543 is an apocalyptic number.

12549657543 is a deficient number, since it is larger than the sum of its proper divisors (4633337913).

12549657543 is a wasteful number, since it uses less digits than its factorization.

12549657543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346534.

The product of its digits is 4536000, while the sum is 51.

The spelling of 12549657543 in words is "twelve billion, five hundred forty-nine million, six hundred fifty-seven thousand, five hundred forty-three".