1668683517 has 8 divisors (see below), whose sum is σ = 2249910720. Its totient is φ = 1099956000.

The previous prime is 1668683509. The next prime is 1668683537. The reversal of 1668683517 is 7153868661.

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

It is not a de Polignac number, because 1668683517 - 2³ = 1668683509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668683517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668683537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3124609 + ... + 3125142.

It is an arithmetic number, because the mean of its divisors is an integer number (281238840).

Almost surely, 2^1668683517 is an apocalyptic number.

It is an amenable number.

1668683517 is a deficient number, since it is larger than the sum of its proper divisors (581227203).

1668683517 is an equidigital number, since it uses as much as digits as its factorization.

1668683517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249843.

The product of its digits is 1451520, while the sum is 51.

The square root of 1668683517 is about 40849.5228491105. The cubic root of 1668683517 is about 1186.1091568118.

The spelling of 1668683517 in words is "one billion, six hundred sixty-eight million, six hundred eighty-three thousand, five hundred seventeen".