1665273316 has 48 divisors (see below), whose sum is σ = 3536991360. Its totient is φ = 670118400.

The previous prime is 1665273307. The next prime is 1665273331. The reversal of 1665273316 is 6133725661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46266 + ... + 73966.

It is an arithmetic number, because the mean of its divisors is an integer number (73687320).

Almost surely, 2^1665273316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665273316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768495680).

1665273316 is an abundant number, since it is smaller than the sum of its proper divisors (1871718044).

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

1665273316 is a wasteful number, since it uses less digits than its factorization.

1665273316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27844 (or 27842 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 1665273316 is about 40807.7604874367. The cubic root of 1665273316 is about 1185.3006094042.

Adding to 1665273316 its reverse (6133725661), we get a palindrome (7798998977).

The spelling of 1665273316 in words is "one billion, six hundred sixty-five million, two hundred seventy-three thousand, three hundred sixteen".