1668795819 has 8 divisors (see below), whose sum is σ = 2232310080. Its totient is φ = 1108906056.

The previous prime is 1668795781. The next prime is 1668795827. The reversal of 1668795819 is 9185978661.

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

It is not a de Polignac number, because 1668795819 - 2⁹ = 1668795307 is a prime.

It is a super-2 number, since 2×1668795819² = 5569758971023761522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1668795829) 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, 905049 + ... + 906890.

It is an arithmetic number, because the mean of its divisors is an integer number (279038760).

Almost surely, 2^1668795819 is an apocalyptic number.

1668795819 is a deficient number, since it is larger than the sum of its proper divisors (563514261).

1668795819 is a wasteful number, since it uses less digits than its factorization.

1668795819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812249.

The product of its digits is 6531840, while the sum is 60.

The square root of 1668795819 is about 40850.8974075234. The cubic root of 1668795819 is about 1186.1357645020.

The spelling of 1668795819 in words is "one billion, six hundred sixty-eight million, seven hundred ninety-five thousand, eight hundred nineteen".