12655856640 has 352 divisors, whose sum is σ = 47766564864. Its totient is φ = 2798714880.

The previous prime is 12655856639. The next prime is 12655856657. The reversal of 12655856640 is 4665855621.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 12655856640.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3331222 + ... + 3335018.

Almost surely, 2^12655856640 is an apocalyptic number.

12655856640 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 12655856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23883282432).

12655856640 is an abundant number, since it is smaller than the sum of its proper divisors (35110708224).

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

12655856640 is a wasteful number, since it uses less digits than its factorization.

12655856640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863 (or 3845 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 12655856640 in words is "twelve billion, six hundred fifty-five million, eight hundred fifty-six thousand, six hundred forty".