133666944 has 64 divisors (see below), whose sum is σ = 356257440. Its totient is φ = 44404736.

The previous prime is 133666913. The next prime is 133666979. The reversal of 133666944 is 449666331.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 133666896 and 133666905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225112 + ... + 225704.

Almost surely, 2^133666944 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 133666944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178128720).

133666944 is an abundant number, since it is smaller than the sum of its proper divisors (222590496).

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

133666944 is an equidigital number, since it uses as much as digits as its factorization.

133666944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1185 counting only the distinct ones).

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

The square root of 133666944 is about 11561.4421245794. The cubic root of 133666944 is about 511.2986817264.

The spelling of 133666944 in words is "one hundred thirty-three million, six hundred sixty-six thousand, nine hundred forty-four".