665884568051 has 4 divisors (see below), whose sum is σ = 665998186704. Its totient is φ = 665770949400.

The previous prime is 665884567981. The next prime is 665884568077. The reversal of 665884568051 is 150865488566.

It is a happy number.

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 665884568051 - 2¹⁴ = 665884551667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665884561051) 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 3 ways as a sum of consecutive naturals, for example, 56800535 + ... + 56812256.

It is an arithmetic number, because the mean of its divisors is an integer number (166499546676).

Almost surely, 2^665884568051 is an apocalyptic number.

665884568051 is a deficient number, since it is larger than the sum of its proper divisors (113618653).

665884568051 is a wasteful number, since it uses less digits than its factorization.

665884568051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113618652.

The product of its (nonzero) digits is 55296000, while the sum is 62.

The spelling of 665884568051 in words is "six hundred sixty-five billion, eight hundred eighty-four million, five hundred sixty-eight thousand, fifty-one".