133581633531 has 16 divisors (see below), whose sum is σ = 184055393280. Its totient is φ = 86122159200.

The previous prime is 133581633469. The next prime is 133581633551. The reversal of 133581633531 is 135336185331.

It is not a de Polignac number, because 133581633531 - 2¹⁸ = 133581371387 is a prime.

It is a super-2 number, since 2×133581633531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133581633551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5113291 + ... + 5139348.

It is an arithmetic number, because the mean of its divisors is an integer number (11503462080).

Almost surely, 2^133581633531 is an apocalyptic number.

133581633531 is a deficient number, since it is larger than the sum of its proper divisors (50473759749).

133581633531 is a wasteful number, since it uses less digits than its factorization.

133581633531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10252786.

The product of its digits is 291600, while the sum is 42.

The spelling of 133581633531 in words is "one hundred thirty-three billion, five hundred eighty-one million, six hundred thirty-three thousand, five hundred thirty-one".