665545326303 has 64 divisors (see below), whose sum is σ = 1049732812800. Its totient is φ = 369766425600.

The previous prime is 665545326293. The next prime is 665545326307. The reversal of 665545326303 is 303623545566.

It is a happy number.

It is not a de Polignac number, because 665545326303 - 2³⁷ = 528106372831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665545326307) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73544523 + ... + 73553571.

It is an arithmetic number, because the mean of its divisors is an integer number (16402075200).

Almost surely, 2^665545326303 is an apocalyptic number.

665545326303 is a deficient number, since it is larger than the sum of its proper divisors (384187486497).

665545326303 is a wasteful number, since it uses less digits than its factorization.

665545326303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240.

The product of its (nonzero) digits is 5832000, while the sum is 48.

The spelling of 665545326303 in words is "six hundred sixty-five billion, five hundred forty-five million, three hundred twenty-six thousand, three hundred three".