2660805644 has 72 divisors (see below), whose sum is σ = 5494230000. Its totient is φ = 1124151168.

The previous prime is 2660805611. The next prime is 2660805647. The reversal of 2660805644 is 4465080662.

It is not an unprimeable number, because it can be changed into a prime (2660805647) 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, 5227262 + ... + 5227770.

It is an arithmetic number, because the mean of its divisors is an integer number (76308750).

Almost surely, 2^2660805644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2660805644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2747115000).

2660805644 is an abundant number, since it is smaller than the sum of its proper divisors (2833424356).

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

2660805644 is a wasteful number, since it uses less digits than its factorization.

2660805644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 2660805644 is about 51582.9976251865. The cubic root of 2660805644 is about 1385.7058519404.

The spelling of 2660805644 in words is "two billion, six hundred sixty million, eight hundred five thousand, six hundred forty-four".