133666533 has 96 divisors (see below), whose sum is σ = 266902272. Its totient is φ = 62208000.

The previous prime is 133666523. The next prime is 133666567. The reversal of 133666533 is 335666331.

It is not a de Polignac number, because 133666533 - 2⁶ = 133666469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133666523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 333133 + ... + 333533.

It is an arithmetic number, because the mean of its divisors is an integer number (2780232).

Almost surely, 2^133666533 is an apocalyptic number.

133666533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

133666533 is a deficient number, since it is larger than the sum of its proper divisors (133235739).

133666533 is a wasteful number, since it uses less digits than its factorization.

133666533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 472 counting only the distinct ones).

The product of its digits is 87480, while the sum is 36.

The square root of 133666533 is about 11561.4243499666. The cubic root of 133666533 is about 511.2981576777.

It can be divided in two parts, 133 and 666533, that added together give a palindrome (666666).

The spelling of 133666533 in words is "one hundred thirty-three million, six hundred sixty-six thousand, five hundred thirty-three".