1668481456 has 40 divisors (see below), whose sum is σ = 3571673184. Its totient is φ = 751027200.

The previous prime is 1668481417. The next prime is 1668481459. The reversal of 1668481456 is 6541848661.

It is not an unprimeable number, because it can be changed into a prime (1668481459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127095 + ... + 139606.

Almost surely, 2^1668481456 is an apocalyptic number.

1668481456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668481456 is an abundant number, since it is smaller than the sum of its proper divisors (1903191728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668481456 is a wasteful number, since it uses less digits than its factorization.

1668481456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266749 (or 266743 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 1668481456 is about 40847.0495384918. The cubic root of 1668481456 is about 1186.0612795332.

The spelling of 1668481456 in words is "one billion, six hundred sixty-eight million, four hundred eighty-one thousand, four hundred fifty-six".