133423231565 has 8 divisors (see below), whose sum is σ = 172423868568. Its totient is φ = 98527924800.

The previous prime is 133423231559. The next prime is 133423231589. The reversal of 133423231565 is 565132324331.

It can be written as a sum of positive squares in 4 ways, for example, as 393070276 + 133030161289 = 19826^2 + 364733^2 .

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

It is not a de Polignac number, because 133423231565 - 2⁴ = 133423231549 is a prime.

It is a super-2 number, since 2×133423231565² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026332486 + ... + 1026332615.

It is an arithmetic number, because the mean of its divisors is an integer number (21552983571).

Almost surely, 2^133423231565 is an apocalyptic number.

It is an amenable number.

133423231565 is a deficient number, since it is larger than the sum of its proper divisors (39000637003).

133423231565 is a wasteful number, since it uses less digits than its factorization.

133423231565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052665119.

The product of its digits is 194400, while the sum is 38.

Adding to 133423231565 its reverse (565132324331), we get a palindrome (698555555896).

The spelling of 133423231565 in words is "one hundred thirty-three billion, four hundred twenty-three million, two hundred thirty-one thousand, five hundred sixty-five".