133855565 has 8 divisors (see below), whose sum is σ = 160702488. Its totient is φ = 107033920.

The previous prime is 133855537. The next prime is 133855567. The reversal of 133855565 is 565558331.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1582564 + 132273001 = 1258^2 + 11501^2 .

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

It is not a de Polignac number, because 133855565 - 2¹⁰ = 133854541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133855567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8495 + ... + 18435.

It is an arithmetic number, because the mean of its divisors is an integer number (20087811).

Almost surely, 2^133855565 is an apocalyptic number.

It is an amenable number.

133855565 is a deficient number, since it is larger than the sum of its proper divisors (26846923).

133855565 is an equidigital number, since it uses as much as digits as its factorization.

133855565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12639.

The product of its digits is 270000, while the sum is 41.

The square root of 133855565 is about 11569.5965789651. The cubic root of 133855565 is about 511.5390711039.

The spelling of 133855565 in words is "one hundred thirty-three million, eight hundred fifty-five thousand, five hundred sixty-five".