12655440000 has 1120 divisors, whose sum is σ = 55725162240. Its totient is φ = 2799360000.

The previous prime is 12655439989. The next prime is 12655440041. The reversal of 12655440000 is 4455621.

12655440000 is a `hidden beast` number, since 1 + 2 + 655 + 4 + 4 + 0 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 408239985 + ... + 408240015.

Almost surely, 2^12655440000 is an apocalyptic number.

12655440000 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 12655440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27862581120).

12655440000 is an abundant number, since it is smaller than the sum of its proper divisors (43069722240).

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

12655440000 is an frugal number, since it uses more digits than its factorization.

12655440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 12655440000 its reverse (4455621), we get a palindrome (12659895621).

The spelling of 12655440000 in words is "twelve billion, six hundred fifty-five million, four hundred forty thousand".