133665563 has 4 divisors (see below), whose sum is σ = 133689168. Its totient is φ = 133641960.

The previous prime is 133665547. The next prime is 133665569. The reversal of 133665563 is 365566331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365566331 = 13 ⋅28120487.

It is a cyclic number.

It is not a de Polignac number, because 133665563 - 2⁴ = 133665547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133665569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2345 + ... + 16517.

It is an arithmetic number, because the mean of its divisors is an integer number (33422292).

Almost surely, 2^133665563 is an apocalyptic number.

133665563 is a deficient number, since it is larger than the sum of its proper divisors (23605).

133665563 is an equidigital number, since it uses as much as digits as its factorization.

133665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23604.

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

The square root of 133665563 is about 11561.3824000420. The cubic root of 133665563 is about 511.2969208674.

The spelling of 133665563 in words is "one hundred thirty-three million, six hundred sixty-five thousand, five hundred sixty-three".