6611645620 has 24 divisors (see below), whose sum is σ = 14363231400. Its totient is φ = 2553462912.

The previous prime is 6611645603. The next prime is 6611645639. The reversal of 6611645620 is 265461166.

It can be written as a sum of positive squares in 4 ways, for example, as 1741559824 + 4870085796 = 41732^2 + 69786^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6611645620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5699115 + ... + 5700274.

It is an arithmetic number, because the mean of its divisors is an integer number (598467975).

Almost surely, 2^6611645620 is an apocalyptic number.

It is an amenable number.

6611645620 is an abundant number, since it is smaller than the sum of its proper divisors (7751585780).

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

6611645620 is a wasteful number, since it uses less digits than its factorization.

6611645620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11399427 (or 11399425 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 6611645620 is about 81312.0262937777. The cubic root of 6611645620 is about 1876.8800692991.

The spelling of 6611645620 in words is "six billion, six hundred eleven million, six hundred forty-five thousand, six hundred twenty".