1668353608 has 8 divisors (see below), whose sum is σ = 3128163030. Its totient is φ = 834176800.

The previous prime is 1668353593. The next prime is 1668353627. The reversal of 1668353608 is 8063538661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1044453124 + 623900484 = 32318^2 + 24978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1668353608² = 5566807522653235328, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 104272093 + ... + 104272108.

Almost surely, 2^1668353608 is an apocalyptic number.

It is an amenable number.

1668353608 is a deficient number, since it is larger than the sum of its proper divisors (1459809422).

1668353608 is a wasteful number, since it uses less digits than its factorization.

1668353608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208544207 (or 208544203 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1668353608 is about 40845.4845484786. The cubic root of 1668353608 is about 1186.0309846334.

The spelling of 1668353608 in words is "one billion, six hundred sixty-eight million, three hundred fifty-three thousand, six hundred eight".