6616661000 has 64 divisors (see below), whose sum is σ = 15642834480. Its totient is φ = 2619340800.

The previous prime is 6616660993. The next prime is 6616661003. The reversal of 6616661000 is 1666166.

It can be written as a sum of positive squares in 8 ways, for example, as 40424164 + 6576236836 = 6358^2 + 81094^2 .

It is not an unprimeable number, because it can be changed into a prime (6616661003) 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, 62894 + ... + 131106.

Almost surely, 2^6616661000 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 6616661000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7821417240).

6616661000 is an abundant number, since it is smaller than the sum of its proper divisors (9026173480).

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

6616661000 is a wasteful number, since it uses less digits than its factorization.

6616661000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68331 (or 68317 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6616661000 is about 81342.8607807717. The cubic root of 6616661000 is about 1877.3545294716.

The spelling of 6616661000 in words is "six billion, six hundred sixteen million, six hundred sixty-one thousand".