12547991117 has 4 divisors (see below), whose sum is σ = 12952765056. Its totient is φ = 12143217180.

The previous prime is 12547991089. The next prime is 12547991123. The reversal of 12547991117 is 71119974521.

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 not a de Polignac number, because 12547991117 - 2¹⁰ = 12547990093 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 (12547991167) 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, 202386923 + ... + 202386984.

It is an arithmetic number, because the mean of its divisors is an integer number (3238191264).

Almost surely, 2^12547991117 is an apocalyptic number.

It is an amenable number.

12547991117 is a deficient number, since it is larger than the sum of its proper divisors (404773939).

12547991117 is an equidigital number, since it uses as much as digits as its factorization.

12547991117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404773938.

The product of its digits is 158760, while the sum is 47.

The spelling of 12547991117 in words is "twelve billion, five hundred forty-seven million, nine hundred ninety-one thousand, one hundred seventeen".