1665605163 has 8 divisors (see below), whose sum is σ = 2226402448. Its totient is φ = 1107605664.

The previous prime is 1665605159. The next prime is 1665605171. The reversal of 1665605163 is 3615065661.

1665605163 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665605163 - 2² = 1665605159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665605173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698056 + ... + 700437.

It is an arithmetic number, because the mean of its divisors is an integer number (278300306).

Almost surely, 2^1665605163 is an apocalyptic number.

1665605163 is a deficient number, since it is larger than the sum of its proper divisors (560797285).

1665605163 is a wasteful number, since it uses less digits than its factorization.

1665605163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398893.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 1665605163 is about 40811.8262639642. The cubic root of 1665605163 is about 1185.3793376872.

The spelling of 1665605163 in words is "one billion, six hundred sixty-five million, six hundred five thousand, one hundred sixty-three".