6661659085 has 8 divisors (see below), whose sum is σ = 7995063960. Its totient is φ = 5328611904.

The previous prime is 6661659077. The next prime is 6661659089. The reversal of 6661659085 is 5809561666.

It can be written as a sum of positive squares in 4 ways, for example, as 2811332484 + 3850326601 = 53022^2 + 62051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6661659085 - 2³ = 6661659077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661659089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46582 + ... + 124471.

It is an arithmetic number, because the mean of its divisors is an integer number (999382995).

Almost surely, 2^6661659085 is an apocalyptic number.

It is an amenable number.

6661659085 is a deficient number, since it is larger than the sum of its proper divisors (1333404875).

6661659085 is a wasteful number, since it uses less digits than its factorization.

6661659085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178847.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The square root of 6661659085 is about 81618.9872823720. The cubic root of 6661659085 is about 1881.6007082497.

The spelling of 6661659085 in words is "six billion, six hundred sixty-one million, six hundred fifty-nine thousand, eighty-five".