660856209811 has 8 divisors (see below), whose sum is σ = 765901764864. Its totient is φ = 558470036040.

The previous prime is 660856209809. The next prime is 660856209817. The reversal of 660856209811 is 118902658066.

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

It is not a de Polignac number, because 660856209811 - 2¹ = 660856209809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660856209817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664844785 + ... + 664845778.

It is an arithmetic number, because the mean of its divisors is an integer number (95737720608).

Almost surely, 2^660856209811 is an apocalyptic number.

660856209811 is a deficient number, since it is larger than the sum of its proper divisors (105045555053).

660856209811 is a wasteful number, since it uses less digits than its factorization.

660856209811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329690641.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 660856209811 in words is "six hundred sixty billion, eight hundred fifty-six million, two hundred nine thousand, eight hundred eleven".