12537116549 has 4 divisors (see below), whose sum is σ = 12544041120. Its totient is φ = 12530191980.

The previous prime is 12537116479. The next prime is 12537116563. The reversal of 12537116549 is 94561173521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12537116549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12537176549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3459569 + ... + 3463190.

It is an arithmetic number, because the mean of its divisors is an integer number (3136010280).

Almost surely, 2^12537116549 is an apocalyptic number.

It is an amenable number.

12537116549 is a deficient number, since it is larger than the sum of its proper divisors (6924571).

12537116549 is an equidigital number, since it uses as much as digits as its factorization.

12537116549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924570.

The product of its digits is 226800, while the sum is 44.

The spelling of 12537116549 in words is "twelve billion, five hundred thirty-seven million, one hundred sixteen thousand, five hundred forty-nine".