12496989891 has 4 divisors (see below), whose sum is σ = 16662653192. Its totient is φ = 8331326592.

The previous prime is 12496989863. The next prime is 12496989893. The reversal of 12496989891 is 19898969421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12496989891 - 2¹¹ = 12496987843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12496989893) 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, 2082831646 + ... + 2082831651.

It is an arithmetic number, because the mean of its divisors is an integer number (4165663298).

Almost surely, 2^12496989891 is an apocalyptic number.

12496989891 is a deficient number, since it is larger than the sum of its proper divisors (4165663301).

12496989891 is an equidigital number, since it uses as much as digits as its factorization.

12496989891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165663300.

The product of its digits is 20155392, while the sum is 66.

The spelling of 12496989891 in words is "twelve billion, four hundred ninety-six million, nine hundred eighty-nine thousand, eight hundred ninety-one".