665638475360 has 24 divisors (see below), whose sum is σ = 1572570898416. Its totient is φ = 266255390080.

The previous prime is 665638475323. The next prime is 665638475419. The reversal of 665638475360 is 63574836566.

It is a self number, because there is not a number n which added to its sum of digits gives 665638475360.

It is a congruent number.

It is an unprimeable number.

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, 2080120076 + ... + 2080120395.

It is an arithmetic number, because the mean of its divisors is an integer number (65523787434).

Almost surely, 2^665638475360 is an apocalyptic number.

It is an amenable number.

665638475360 is an abundant number, since it is smaller than the sum of its proper divisors (906932423056).

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

665638475360 is a wasteful number, since it uses less digits than its factorization.

665638475360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160240486 (or 4160240478 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 59.

The spelling of 665638475360 in words is "six hundred sixty-five billion, six hundred thirty-eight million, four hundred seventy-five thousand, three hundred sixty".