1668518517 has 8 divisors (see below), whose sum is σ = 2245483296. Its totient is φ = 1101949712.

The previous prime is 1668518491. The next prime is 1668518557. The reversal of 1668518517 is 7158158661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1668518517 - 2¹⁰ = 1668517493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668518557) 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 7 ways as a sum of consecutive naturals, for example, 2598618 + ... + 2599259.

It is an arithmetic number, because the mean of its divisors is an integer number (280685412).

Almost surely, 2^1668518517 is an apocalyptic number.

It is an amenable number.

1668518517 is a deficient number, since it is larger than the sum of its proper divisors (576964779).

1668518517 is a wasteful number, since it uses less digits than its factorization.

1668518517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197987.

The product of its digits is 403200, while the sum is 48.

The square root of 1668518517 is about 40847.5031917497. The cubic root of 1668518517 is about 1186.0700612294.

The spelling of 1668518517 in words is "one billion, six hundred sixty-eight million, five hundred eighteen thousand, five hundred seventeen".