12605566640 has 160 divisors (see below), whose sum is σ = 31826623680. Its totient is φ = 4625334272.

The previous prime is 12605566639. The next prime is 12605566669. The reversal of 12605566640 is 4666550621.

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, 12901832 + ... + 12902808.

It is an arithmetic number, because the mean of its divisors is an integer number (198916398).

Almost surely, 2^12605566640 is an apocalyptic number.

12605566640 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 12605566640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15913311840).

12605566640 is an abundant number, since it is smaller than the sum of its proper divisors (19221057040).

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

12605566640 is a wasteful number, since it uses less digits than its factorization.

12605566640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 12605566640 in words is "twelve billion, six hundred five million, five hundred sixty-six thousand, six hundred forty".