6660855673 has 4 divisors (see below), whose sum is σ = 6661043620. Its totient is φ = 6660667728.

The previous prime is 6660855623. The next prime is 6660855709. The reversal of 6660855673 is 3765580666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2867281209 + 3793574464 = 53547^2 + 61592^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660855673 - 2²¹ = 6658758521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660855673.

It is not an unprimeable number, because it can be changed into a prime (6660855623) 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, 22890 + ... + 117667.

It is an arithmetic number, because the mean of its divisors is an integer number (1665260905).

Almost surely, 2^6660855673 is an apocalyptic number.

It is an amenable number.

6660855673 is a deficient number, since it is larger than the sum of its proper divisors (187947).

6660855673 is a wasteful number, since it uses less digits than its factorization.

6660855673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187946.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The square root of 6660855673 is about 81614.0654115453. The cubic root of 6660855673 is about 1881.5250633618.

The spelling of 6660855673 in words is "six billion, six hundred sixty million, eight hundred fifty-five thousand, six hundred seventy-three".