133445668 has 6 divisors (see below), whose sum is σ = 233529926. Its totient is φ = 66722832.

The previous prime is 133445651. The next prime is 133445671. The reversal of 133445668 is 866544331.

It can be written as a sum of positive squares in only one way, i.e., 113891584 + 19554084 = 10672^2 + 4422^2 .

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 133445668.

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, 16680705 + ... + 16680712.

Almost surely, 2^133445668 is an apocalyptic number.

It is an amenable number.

133445668 is a deficient number, since it is larger than the sum of its proper divisors (100084258).

133445668 is a wasteful number, since it uses less digits than its factorization.

133445668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33361421 (or 33361419 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 133445668 is about 11551.8685934354. The cubic root of 133445668 is about 511.0163865135.

Adding to 133445668 its reverse (866544331), we get a palindrome (999989999).

The spelling of 133445668 in words is "one hundred thirty-three million, four hundred forty-five thousand, six hundred sixty-eight".