1668687793 has 4 divisors (see below), whose sum is σ = 1671531120. Its totient is φ = 1665844468.

The previous prime is 1668687781. The next prime is 1668687821. The reversal of 1668687793 is 3977868661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668687793 - 2⁹ = 1668687281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668687763) 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 3 ways as a sum of consecutive naturals, for example, 1420783 + ... + 1421956.

It is an arithmetic number, because the mean of its divisors is an integer number (417882780).

Almost surely, 2^1668687793 is an apocalyptic number.

It is an amenable number.

1668687793 is a deficient number, since it is larger than the sum of its proper divisors (2843327).

1668687793 is an equidigital number, since it uses as much as digits as its factorization.

1668687793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843326.

The product of its digits is 18289152, while the sum is 61.

The square root of 1668687793 is about 40849.5751875096. The cubic root of 1668687793 is about 1186.1101699454.

The spelling of 1668687793 in words is "one billion, six hundred sixty-eight million, six hundred eighty-seven thousand, seven hundred ninety-three".