12646341640 has 32 divisors (see below), whose sum is σ = 28516573080. Its totient is φ = 5047460352.

The previous prime is 12646341601. The next prime is 12646341641. The reversal of 12646341640 is 4614364621.

12646341640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12641404356 + 4937284 = 112434^2 + 2222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12646341640.

It is not an unprimeable number, because it can be changed into a prime (12646341641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327627 + ... + 364186.

Almost surely, 2^12646341640 is an apocalyptic number.

12646341640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12646341640 is an abundant number, since it is smaller than the sum of its proper divisors (15870231440).

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

12646341640 is a wasteful number, since it uses less digits than its factorization.

12646341640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692281 (or 692277 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 12646341640 in words is "twelve billion, six hundred forty-six million, three hundred forty-one thousand, six hundred forty".