6645560889408 has 224 divisors, whose sum is σ = 20149240473600. Its totient is φ = 1893603557376.

The previous prime is 6645560889353. The next prime is 6645560889449. The reversal of 6645560889408 is 8049880655466.

It is a tau number, because it is divible by the number of its divisors (224).

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, 1609482288 + ... + 1609486416.

It is an arithmetic number, because the mean of its divisors is an integer number (89951966400).

Almost surely, 2^{6645560889408} 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 6645560889408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10074620236800).

6645560889408 is an abundant number, since it is smaller than the sum of its proper divisors (13503679584192).

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

6645560889408 is a wasteful number, since it uses less digits than its factorization.

6645560889408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7097 (or 7087 counting only the distinct ones).

The product of its (nonzero) digits is 398131200, while the sum is 69.

The spelling of 6645560889408 in words is "six trillion, six hundred forty-five billion, five hundred sixty million, eight hundred eighty-nine thousand, four hundred eight".