12643140540 has 24 divisors (see below), whose sum is σ = 35400793680. Its totient is φ = 3371504128.

The previous prime is 12643140529. The next prime is 12643140541. The reversal of 12643140540 is 4504134621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12643140498 and 12643140507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643140541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105359445 + ... + 105359564.

It is an arithmetic number, because the mean of its divisors is an integer number (1475033070).

Almost surely, 2^12643140540 is an apocalyptic number.

12643140540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643140540 is an abundant number, since it is smaller than the sum of its proper divisors (22757653140).

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

12643140540 is a wasteful number, since it uses less digits than its factorization.

12643140540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210719021 (or 210719019 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 12643140540 in words is "twelve billion, six hundred forty-three million, one hundred forty thousand, five hundred forty".