12655520720 has 40 divisors (see below), whose sum is σ = 29428792776. Its totient is φ = 5061398528.

The previous prime is 12655520671. The next prime is 12655520729. The reversal of 12655520720 is 2702555621.

It can be written as a sum of positive squares in 4 ways, for example, as 9168784 + 12646351936 = 3028^2 + 112456^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12655520729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894824 + ... + 908856.

Almost surely, 2^12655520720 is an apocalyptic number.

12655520720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12655520720 is an abundant number, since it is smaller than the sum of its proper divisors (16773272056).

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

12655520720 is a wasteful number, since it uses less digits than its factorization.

12655520720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25319 (or 25313 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 12655520720 in words is "twelve billion, six hundred fifty-five million, five hundred twenty thousand, seven hundred twenty".