665550472653 has 24 divisors (see below), whose sum is σ = 1048771825920. Its totient is φ = 403354066560.

The previous prime is 665550472627. The next prime is 665550472669. The reversal of 665550472653 is 356274055566.

665550472653 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 504 + 72 + 65 + 3 = 666.

It is not a de Polignac number, because 665550472653 - 2⁸ = 665550472397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665550472653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665550472253) 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 23 ways as a sum of consecutive naturals, for example, 7607125 + ... + 7694117.

It is an arithmetic number, because the mean of its divisors is an integer number (43698826080).

Almost surely, 2^665550472653 is an apocalyptic number.

It is an amenable number.

665550472653 is a deficient number, since it is larger than the sum of its proper divisors (383221353267).

665550472653 is a wasteful number, since it uses less digits than its factorization.

665550472653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164289 (or 164286 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 54.

The spelling of 665550472653 in words is "six hundred sixty-five billion, five hundred fifty million, four hundred seventy-two thousand, six hundred fifty-three".