6605745520 has 80 divisors (see below), whose sum is σ = 16778783232. Its totient is φ = 2398618880.

The previous prime is 6605745479. The next prime is 6605745529. The reversal of 6605745520 is 255475066.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6605745529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648789 + ... + 658891.

Almost surely, 2^6605745520 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 6605745520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8389391616).

6605745520 is an abundant number, since it is smaller than the sum of its proper divisors (10173037712).

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

6605745520 is a wasteful number, since it uses less digits than its factorization.

6605745520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870 (or 10864 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 6605745520 is about 81275.7375850875. The cubic root of 6605745520 is about 1876.3216064305.

The spelling of 6605745520 in words is "six billion, six hundred five million, seven hundred forty-five thousand, five hundred twenty".