12556354664 has 64 divisors (see below), whose sum is σ = 28094352000. Its totient is φ = 5256099072.

The previous prime is 12556354661. The next prime is 12556354697. The reversal of 12556354664 is 46645365521.

It is not an unprimeable number, because it can be changed into a prime (12556354661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64784 + ... + 171200.

It is an arithmetic number, because the mean of its divisors is an integer number (438974250).

Almost surely, 2^12556354664 is an apocalyptic number.

12556354664 is a gapful number since it is divisible by the number (14) 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 12556354664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14047176000).

12556354664 is an abundant number, since it is smaller than the sum of its proper divisors (15537997336).

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

12556354664 is a wasteful number, since it uses less digits than its factorization.

12556354664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106487 (or 106469 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 47.

The spelling of 12556354664 in words is "twelve billion, five hundred fifty-six million, three hundred fifty-four thousand, six hundred sixty-four".