12646408566 has 64 divisors (see below), whose sum is σ = 28826668800. Its totient is φ = 3663408000.

The previous prime is 12646408543. The next prime is 12646408571. The reversal of 12646408566 is 66580464621.

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, 160605 + ... + 226023.

It is an arithmetic number, because the mean of its divisors is an integer number (450416700).

Almost surely, 2^12646408566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12646408566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14413334400).

12646408566 is an abundant number, since it is smaller than the sum of its proper divisors (16180260234).

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

12646408566 is a wasteful number, since it uses less digits than its factorization.

12646408566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65565.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 12646408566 in words is "twelve billion, six hundred forty-six million, four hundred eight thousand, five hundred sixty-six".