133563665 has 8 divisors (see below), whose sum is σ = 161929320. Its totient is φ = 105748992.

The previous prime is 133563653. The next prime is 133563697. The reversal of 133563665 is 566365331.

It can be written as a sum of positive squares in 4 ways, for example, as 32581264 + 100982401 = 5708^2 + 10049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133563665 - 2⁴ = 133563649 is a prime.

It is a Curzon number.

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 in 7 ways as a sum of consecutive naturals, for example, 137210 + ... + 138179.

It is an arithmetic number, because the mean of its divisors is an integer number (20241165).

Almost surely, 2^133563665 is an apocalyptic number.

It is an amenable number.

133563665 is a deficient number, since it is larger than the sum of its proper divisors (28365655).

133563665 is an equidigital number, since it uses as much as digits as its factorization.

133563665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275491.

The product of its digits is 145800, while the sum is 38.

The square root of 133563665 is about 11556.9747338999. The cubic root of 133563665 is about 511.1669612445.

The spelling of 133563665 in words is "one hundred thirty-three million, five hundred sixty-three thousand, six hundred sixty-five".