133161665 has 24 divisors (see below), whose sum is σ = 200186280. Its totient is φ = 84284928.

The previous prime is 133161653. The next prime is 133161667. The reversal of 133161665 is 566161331.

It can be written as a sum of positive squares in 4 ways, for example, as 82369 + 133079296 = 287^2 + 11536^2 .

It is not a de Polignac number, because 133161665 - 2¹⁸ = 132899521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133161667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17720 + ... + 24089.

It is an arithmetic number, because the mean of its divisors is an integer number (8341095).

Almost surely, 2^133161665 is an apocalyptic number.

It is an amenable number.

133161665 is a deficient number, since it is larger than the sum of its proper divisors (67024615).

133161665 is a wasteful number, since it uses less digits than its factorization.

133161665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41841 (or 41834 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 133161665 is about 11539.5695326992. The cubic root of 133161665 is about 510.6536089934.

The spelling of 133161665 in words is "one hundred thirty-three million, one hundred sixty-one thousand, six hundred sixty-five".