1668191963 has 16 divisors (see below), whose sum is σ = 1861079040. Its totient is φ = 1485993600.

The previous prime is 1668191957. The next prime is 1668191971. The reversal of 1668191963 is 3691918661.

It is a cyclic number.

It is not a de Polignac number, because 1668191963 - 2⁴ = 1668191947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668191983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473378 + ... + 476888.

It is an arithmetic number, because the mean of its divisors is an integer number (116317440).

Almost surely, 2^1668191963 is an apocalyptic number.

1668191963 is a deficient number, since it is larger than the sum of its proper divisors (192887077).

1668191963 is a wasteful number, since it uses less digits than its factorization.

1668191963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018.

The product of its digits is 419904, while the sum is 50.

The square root of 1668191963 is about 40843.5057628505. The cubic root of 1668191963 is about 1185.9926789709.

The spelling of 1668191963 in words is "one billion, six hundred sixty-eight million, one hundred ninety-one thousand, nine hundred sixty-three".