1668553915 has 16 divisors (see below), whose sum is σ = 2304771840. Its totient is φ = 1135916640.

The previous prime is 1668553891. The next prime is 1668553921. The reversal of 1668553915 is 5193558661.

It is not a de Polignac number, because 1668553915 - 2⁷ = 1668553787 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 166621 + ... + 176350.

It is an arithmetic number, because the mean of its divisors is an integer number (144048240).

Almost surely, 2^1668553915 is an apocalyptic number.

1668553915 is a deficient number, since it is larger than the sum of its proper divisors (636217925).

1668553915 is a wasteful number, since it uses less digits than its factorization.

1668553915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343122.

The product of its digits is 972000, while the sum is 49.

The square root of 1668553915 is about 40847.9364839890. The cubic root of 1668553915 is about 1186.0784487521.

The spelling of 1668553915 in words is "one billion, six hundred sixty-eight million, five hundred fifty-three thousand, nine hundred fifteen".