6661606711 has 4 divisors (see below), whose sum is σ = 6803343072. Its totient is φ = 6519870352.

The previous prime is 6661606703. The next prime is 6661606727. The reversal of 6661606711 is 1176061666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6661606711 - 2³ = 6661606703 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661604711) 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, 70868110 + ... + 70868203.

It is an arithmetic number, because the mean of its divisors is an integer number (1700835768).

Almost surely, 2^6661606711 is an apocalyptic number.

6661606711 is a deficient number, since it is larger than the sum of its proper divisors (141736361).

6661606711 is a wasteful number, since it uses less digits than its factorization.

6661606711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141736360.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 6661606711 is about 81618.6664372801. Note that the first 3 decimals coincide. The cubic root of 6661606711 is about 1881.5957771851.

The spelling of 6661606711 in words is "six billion, six hundred sixty-one million, six hundred six thousand, seven hundred eleven".