12671644840 has 96 divisors (see below), whose sum is σ = 29909978280. Its totient is φ = 4831174656.

The previous prime is 12671644829. The next prime is 12671644913. The reversal of 12671644840 is 4844617621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8866482244 + 3805162596 = 94162^2 + 61686^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7130032 + ... + 7131808.

Almost surely, 2^12671644840 is an apocalyptic number.

12671644840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12671644840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14954989140).

12671644840 is an abundant number, since it is smaller than the sum of its proper divisors (17238333440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12671644840 is a wasteful number, since it uses less digits than its factorization.

12671644840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171 (or 2144 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 12671644840 in words is "twelve billion, six hundred seventy-one million, six hundred forty-four thousand, eight hundred forty".