12649543648 has 120 divisors (see below), whose sum is σ = 29539906200. Its totient is φ = 5330384640.

The previous prime is 12649543589. The next prime is 12649543663. The reversal of 12649543648 is 84634594621.

It is a junction number, because it is equal to n+sod(n) for n = 12649543595 and 12649543604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4685403 + ... + 4688101.

It is an arithmetic number, because the mean of its divisors is an integer number (246165885).

Almost surely, 2^12649543648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12649543648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14769953100).

12649543648 is an abundant number, since it is smaller than the sum of its proper divisors (16890362552).

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

12649543648 is an frugal number, since it uses more digits than its factorization.

12649543648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798 (or 2769 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The spelling of 12649543648 in words is "twelve billion, six hundred forty-nine million, five hundred forty-three thousand, six hundred forty-eight".