1665037360 has 80 divisors (see below), whose sum is σ = 4432769856. Its totient is φ = 569769984.

The previous prime is 1665037351. The next prime is 1665037399. The reversal of 1665037360 is 637305661.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320544 + ... + 325696.

Almost surely, 2^1665037360 is an apocalyptic number.

1665037360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665037360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216384928).

1665037360 is an abundant number, since it is smaller than the sum of its proper divisors (2767732496).

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

1665037360 is a wasteful number, since it uses less digits than its factorization.

1665037360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750 (or 5744 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 1665037360 is about 40804.8693172763. The cubic root of 1665037360 is about 1185.2446241997.

The spelling of 1665037360 in words is "one billion, six hundred sixty-five million, thirty-seven thousand, three hundred sixty".