1660318009 has 9 divisors (see below), whose sum is σ = 1931722191. Its totient is φ = 1422885240.

The previous prime is 1660318003. The next prime is 1660318061. The reversal of 1660318009 is 9008130661.

The square root of 1660318009 is 40747.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1444228009 + 216090000 = 38003^2 + 14700^2 .

It is not a de Polignac number, because 1660318009 - 2⁵ = 1660317977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660318003) 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 8 ways as a sum of consecutive naturals, for example, 282319 + ... + 288139.

It is an arithmetic number, because the mean of its divisors is an integer number (214635799).

Almost surely, 2^1660318009 is an apocalyptic number.

1660318009 is the 40747-th square number.

1660318009 is the 20374-th centered octagonal number.

It is an amenable number.

1660318009 is a deficient number, since it is larger than the sum of its proper divisors (271404182).

1660318009 is an frugal number, since it uses more digits than its factorization.

1660318009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11656 (or 5828 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The cubic root of 1660318009 is about 1184.1237527488.

The spelling of 1660318009 in words is "one billion, six hundred sixty million, three hundred eighteen thousand, nine".