1668804427 has 4 divisors (see below), whose sum is σ = 1709507016. Its totient is φ = 1628101840.

The previous prime is 1668804413. The next prime is 1668804457. The reversal of 1668804427 is 7244088661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1668804427 - 2⁷ = 1668804299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668804457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20351233 + ... + 20351314.

It is an arithmetic number, because the mean of its divisors is an integer number (427376754).

Almost surely, 2^1668804427 is an apocalyptic number.

1668804427 is a deficient number, since it is larger than the sum of its proper divisors (40702589).

1668804427 is an equidigital number, since it uses as much as digits as its factorization.

1668804427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40702588.

The product of its (nonzero) digits is 516096, while the sum is 46.

The square root of 1668804427 is about 40851.0027661501. The cubic root of 1668804427 is about 1186.1378039445.

The spelling of 1668804427 in words is "one billion, six hundred sixty-eight million, eight hundred four thousand, four hundred twenty-seven".