6620600660 has 12 divisors (see below), whose sum is σ = 13903261428. Its totient is φ = 2648240256.

The previous prime is 6620600641. The next prime is 6620600663. The reversal of 6620600660 is 660060266.

It can be written as a sum of positive squares in 2 ways, for example, as 1796742544 + 4823858116 = 42388^2 + 69454^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620600663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165514997 + ... + 165515036.

It is an arithmetic number, because the mean of its divisors is an integer number (1158605119).

Almost surely, 2^6620600660 is an apocalyptic number.

It is an amenable number.

6620600660 is an abundant number, since it is smaller than the sum of its proper divisors (7282660768).

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

6620600660 is a wasteful number, since it uses less digits than its factorization.

6620600660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331030042 (or 331030040 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 6620600660 is about 81367.0735617301. The cubic root of 6620600660 is about 1877.7270573023.

The spelling of 6620600660 in words is "six billion, six hundred twenty million, six hundred thousand, six hundred sixty".