1665964017 has 14 divisors (see below), whose sum is σ = 2497804482. Its totient is φ = 1110642192.

The previous prime is 1665964009. The next prime is 1665964049. The reversal of 1665964017 is 7104695661.

1665964017 is a `hidden beast` number, since 1 + 6 + 6 + 596 + 40 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 919363041 + 746600976 = 30321^2 + 27324^2 .

It is not a de Polignac number, because 1665964017 - 2³ = 1665964009 is a prime.

It is a super-2 number, since 2×1665964017² = 5550872211877552578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1665964217) 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 13 ways as a sum of consecutive naturals, for example, 1141908 + ... + 1143365.

Almost surely, 2^1665964017 is an apocalyptic number.

It is an amenable number.

1665964017 is a deficient number, since it is larger than the sum of its proper divisors (831840465).

1665964017 is an frugal number, since it uses more digits than its factorization.

1665964017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285291 (or 2285276 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1665964017 is about 40816.2224734235. Note that the first 3 decimals coincide. The cubic root of 1665964017 is about 1185.4644614169.

The spelling of 1665964017 in words is "one billion, six hundred sixty-five million, nine hundred sixty-four thousand, seventeen".