665448999 has 4 divisors (see below), whose sum is σ = 887265336. Its totient is φ = 443632664.

The previous prime is 665448961. The next prime is 665449009. The reversal of 665448999 is 999844566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665448999 - 2⁷ = 665448871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665438999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110908164 + ... + 110908169.

It is an arithmetic number, because the mean of its divisors is an integer number (221816334).

Almost surely, 2^665448999 is an apocalyptic number.

665448999 is a deficient number, since it is larger than the sum of its proper divisors (221816337).

665448999 is a wasteful number, since it uses less digits than its factorization.

665448999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221816336.

The product of its digits is 16796160, while the sum is 60.

The square root of 665448999 is about 25796.2981646592. The cubic root of 665448999 is about 873.0482752466.

The spelling of 665448999 in words is "six hundred sixty-five million, four hundred forty-eight thousand, nine hundred ninety-nine".