665438803 has 16 divisors (see below), whose sum is σ = 728186976. Its totient is φ = 605606400.

The previous prime is 665438801. The next prime is 665438833. The reversal of 665438803 is 308834566.

It is a cyclic number.

It is not a de Polignac number, because 665438803 - 2¹ = 665438801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 665438803.

It is not an unprimeable number, because it can be changed into a prime (665438801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69325 + ... + 78337.

It is an arithmetic number, because the mean of its divisors is an integer number (45511686).

Almost surely, 2^665438803 is an apocalyptic number.

665438803 is a deficient number, since it is larger than the sum of its proper divisors (62748173).

665438803 is a wasteful number, since it uses less digits than its factorization.

665438803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9174.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 665438803 is about 25796.1005386473. The cubic root of 665438803 is about 873.0438162795.

The spelling of 665438803 in words is "six hundred sixty-five million, four hundred thirty-eight thousand, eight hundred three".