665544633236 has 96 divisors (see below), whose sum is σ = 1413830702592. Its totient is φ = 267610337280.

The previous prime is 665544633223. The next prime is 665544633241. The reversal of 665544633236 is 632336445566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360337265 + ... + 360339111.

It is an arithmetic number, because the mean of its divisors is an integer number (14727403152).

Almost surely, 2^665544633236 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 665544633236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706915351296).

665544633236 is an abundant number, since it is smaller than the sum of its proper divisors (748286069356).

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

665544633236 is a wasteful number, since it uses less digits than its factorization.

665544633236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849 (or 3847 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 53.

The spelling of 665544633236 in words is "six hundred sixty-five billion, five hundred forty-four million, six hundred thirty-three thousand, two hundred thirty-six".