1668663713 has 8 divisors (see below), whose sum is σ = 1800157608. Its totient is φ = 1540873984.

The previous prime is 1668663697. The next prime is 1668663761. The reversal of 1668663713 is 3173668661.

It can be written as a sum of positive squares in 4 ways, for example, as 871843729 + 796819984 = 29527^2 + 28228^2 .

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 1668663713 - 2⁴ = 1668663697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668663313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925106 + ... + 926907.

It is an arithmetic number, because the mean of its divisors is an integer number (225019701).

Almost surely, 2^1668663713 is an apocalyptic number.

It is an amenable number.

1668663713 is a deficient number, since it is larger than the sum of its proper divisors (131493895).

1668663713 is a wasteful number, since it uses less digits than its factorization.

1668663713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852083.

The product of its digits is 653184, while the sum is 47.

The square root of 1668663713 is about 40849.2804465391. The cubic root of 1668663713 is about 1186.1044645302.

The spelling of 1668663713 in words is "one billion, six hundred sixty-eight million, six hundred sixty-three thousand, seven hundred thirteen".