1665964159 has 2 divisors, whose sum is σ = 1665964160. Its totient is φ = 1665964158.

The previous prime is 1665964151. The next prime is 1665964217. The reversal of 1665964159 is 9514695661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665964159 - 2³ = 1665964151 is a prime.

It is a super-3 number, since 3×1665964159³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665964151) 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 as a sum of consecutive naturals, namely, 832982079 + 832982080.

It is an arithmetic number, because the mean of its divisors is an integer number (832982080).

Almost surely, 2^1665964159 is an apocalyptic number.

1665964159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665964159 is an equidigital number, since it uses as much as digits as its factorization.

1665964159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 52.

The square root of 1665964159 is about 40816.2242129279. The cubic root of 1665964159 is about 1185.4644950983.

The spelling of 1665964159 in words is "one billion, six hundred sixty-five million, nine hundred sixty-four thousand, one hundred fifty-nine".