1668500005 has 8 divisors (see below), whose sum is σ = 2003108472. Its totient is φ = 1334194368.

The previous prime is 1668499993. The next prime is 1668500033. The reversal of 1668500005 is 5000058661.

It can be written as a sum of positive squares in 4 ways, for example, as 732568356 + 935931649 = 27066^2 + 30593^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668500005 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668500005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63402 + ... + 85771.

It is an arithmetic number, because the mean of its divisors is an integer number (250388559).

Almost surely, 2^1668500005 is an apocalyptic number.

It is an amenable number.

1668500005 is a deficient number, since it is larger than the sum of its proper divisors (334608467).

1668500005 is a wasteful number, since it uses less digits than its factorization.

1668500005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151415.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1668500005 is about 40847.2765922038. The cubic root of 1668500005 is about 1186.0656747812.

Adding to 1668500005 its reverse (5000058661), we get a palindrome (6668558666).

The spelling of 1668500005 in words is "one billion, six hundred sixty-eight million, five hundred thousand, five".