1665941518 has 16 divisors (see below), whose sum is σ = 2561278896. Its totient is φ = 812246400.

The previous prime is 1665941513. The next prime is 1665941521. The reversal of 1665941518 is 8151495661.

It is a super-2 number, since 2×1665941518² = 5550722282792288648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665941513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36918 + ... + 68518.

It is an arithmetic number, because the mean of its divisors is an integer number (160079931).

Almost surely, 2^1665941518 is an apocalyptic number.

1665941518 is a deficient number, since it is larger than the sum of its proper divisors (895337378).

1665941518 is a wasteful number, since it uses less digits than its factorization.

1665941518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32259.

The product of its digits is 259200, while the sum is 46.

The square root of 1665941518 is about 40815.9468590403. The cubic root of 1665941518 is about 1185.4591247901.

The spelling of 1665941518 in words is "one billion, six hundred sixty-five million, nine hundred forty-one thousand, five hundred eighteen".