133663668 has 48 divisors (see below), whose sum is σ = 328769280. Its totient is φ = 42200704.

The previous prime is 133663643. The next prime is 133663681. The reversal of 133663668 is 866366331.

It is a happy number.

It is a super-2 number, since 2×133663668² = 35731952286428448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14821 + ... + 22067.

It is an arithmetic number, because the mean of its divisors is an integer number (6849360).

Almost surely, 2^133663668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133663668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164384640).

133663668 is an abundant number, since it is smaller than the sum of its proper divisors (195105612).

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

133663668 is a wasteful number, since it uses less digits than its factorization.

133663668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336 (or 7334 counting only the distinct ones).

The product of its digits is 279936, while the sum is 42.

The square root of 133663668 is about 11561.3004458841. The cubic root of 133663668 is about 511.2945046075.

The spelling of 133663668 in words is "one hundred thirty-three million, six hundred sixty-three thousand, six hundred sixty-eight".