133666441345565 has 4 divisors (see below), whose sum is σ = 160399729614684. Its totient is φ = 106933153076448.

The previous prime is 133666441345537. The next prime is 133666441345597. The reversal of 133666441345565 is 565543144666331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15106856656516 + 118559584689049 = 3886754^2 + 10888507^2 .

It is a cyclic number.

It is not a de Polignac number, because 133666441345565 - 2²⁶ = 133666374236701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133666441345498 and 133666441345507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13366644134552 + ... + 13366644134561.

It is an arithmetic number, because the mean of its divisors is an integer number (40099932403671).

Almost surely, 2^{133666441345565} is an apocalyptic number.

It is an amenable number.

133666441345565 is a deficient number, since it is larger than the sum of its proper divisors (26733288269119).

133666441345565 is an equidigital number, since it uses as much as digits as its factorization.

133666441345565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26733288269118.

The product of its digits is 279936000, while the sum is 62.

The spelling of 133666441345565 in words is "one hundred thirty-three trillion, six hundred sixty-six billion, four hundred forty-one million, three hundred forty-five thousand, five hundred sixty-five".