665686642411 has 16 divisors (see below), whose sum is σ = 779804641728. Its totient is φ = 556671353280.

The previous prime is 665686642381. The next prime is 665686642421. The reversal of 665686642411 is 114246686566.

It is not a de Polignac number, because 665686642411 - 2¹¹ = 665686640363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665686642421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207460 + ... + 1172353.

It is an arithmetic number, because the mean of its divisors is an integer number (48737790108).

Almost surely, 2^665686642411 is an apocalyptic number.

665686642411 is a deficient number, since it is larger than the sum of its proper divisors (114117999317).

665686642411 is an frugal number, since it uses more digits than its factorization.

665686642411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379943 (or 1379861 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 55.

The spelling of 665686642411 in words is "six hundred sixty-five billion, six hundred eighty-six million, six hundred forty-two thousand, four hundred eleven".