12656740560 has 160 divisors (see below), whose sum is σ = 41414492160. Its totient is φ = 3188703744.

The previous prime is 12656740559. The next prime is 12656740583. The reversal of 12656740560 is 6504765621.

It is a super-2 number, since 2×12656740560² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1742857 + ... + 1750103.

It is an arithmetic number, because the mean of its divisors is an integer number (258840576).

Almost surely, 2^12656740560 is an apocalyptic number.

12656740560 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 12656740560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20707246080).

12656740560 is an abundant number, since it is smaller than the sum of its proper divisors (28757751600).

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

12656740560 is a wasteful number, since it uses less digits than its factorization.

12656740560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7665 (or 7659 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 12656740560 in words is "twelve billion, six hundred fifty-six million, seven hundred forty thousand, five hundred sixty".