665534017116 has 144 divisors (see below), whose sum is σ = 1819665993600. Its totient is φ = 204382797696.

The previous prime is 665534017111. The next prime is 665534017133. The reversal of 665534017116 is 611710435566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665534017111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59189791 + ... + 59201033.

It is an arithmetic number, because the mean of its divisors is an integer number (12636569400).

Almost surely, 2^665534017116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665534017116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909832996800).

665534017116 is an abundant number, since it is smaller than the sum of its proper divisors (1154131976484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665534017116 is a wasteful number, since it uses less digits than its factorization.

665534017116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13648 (or 13643 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 665534017116 in words is "six hundred sixty-five billion, five hundred thirty-four million, seventeen thousand, one hundred sixteen".