12180843640 has 64 divisors (see below), whose sum is σ = 32332584960. Its totient is φ = 4041567360.

The previous prime is 12180843637. The next prime is 12180843641. The reversal of 12180843640 is 4634808121.

It is a self number, because there is not a number n which added to its sum of digits gives 12180843640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12180843641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 692982 + ... + 710341.

It is an arithmetic number, because the mean of its divisors is an integer number (505196640).

Almost surely, 2^12180843640 is an apocalyptic number.

12180843640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12180843640 is an abundant number, since it is smaller than the sum of its proper divisors (20151741320).

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

12180843640 is a wasteful number, since it uses less digits than its factorization.

12180843640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403372 (or 1403368 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 12180843640 in words is "twelve billion, one hundred eighty million, eight hundred forty-three thousand, six hundred forty".