26643006660 has 96 divisors (see below), whose sum is σ = 75385336320. Its totient is φ = 7030259712.

The previous prime is 26643006623. The next prime is 26643006683. The reversal of 26643006660 is 6660034662.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4560021 + ... + 4565859.

It is an arithmetic number, because the mean of its divisors is an integer number (785263920).

Almost surely, 2^26643006660 is an apocalyptic number.

26643006660 is a gapful number since it is divisible by the number (20) 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 26643006660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37692668160).

26643006660 is an abundant number, since it is smaller than the sum of its proper divisors (48742329660).

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

26643006660 is a wasteful number, since it uses less digits than its factorization.

26643006660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6637 (or 6635 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 26643006660 in words is "twenty-six billion, six hundred forty-three million, six thousand, six hundred sixty".