12656411540 has 72 divisors (see below), whose sum is σ = 27710172672. Its totient is φ = 4850746560.

The previous prime is 12656411459. The next prime is 12656411543. The reversal of 12656411540 is 4511465621.

It is a self number, because there is not a number n which added to its sum of digits gives 12656411540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656411543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7097489 + ... + 7099271.

Almost surely, 2^12656411540 is an apocalyptic number.

12656411540 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 12656411540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13855086336).

12656411540 is an abundant number, since it is smaller than the sum of its proper divisors (15053761132).

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

12656411540 is a wasteful number, since it uses less digits than its factorization.

12656411540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 1928 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 12656411540 in words is "twelve billion, six hundred fifty-six million, four hundred eleven thousand, five hundred forty".