6661005606 has 24 divisors (see below), whose sum is σ = 14450318064. Its totient is φ = 2217544560.

The previous prime is 6661005577. The next prime is 6661005613. The reversal of 6661005606 is 6065001666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217810 + ... + 246501.

It is an arithmetic number, because the mean of its divisors is an integer number (602096586).

Almost surely, 2^6661005606 is an apocalyptic number.

6661005606 is an abundant number, since it is smaller than the sum of its proper divisors (7789312458).

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

6661005606 is a wasteful number, since it uses less digits than its factorization.

6661005606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465116 (or 465113 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6661005606 is about 81614.9839551537. The cubic root of 6661005606 is about 1881.5391806962.

The spelling of 6661005606 in words is "six billion, six hundred sixty-one million, five thousand, six hundred six".