11531255533 has 16 divisors (see below), whose sum is σ = 13957608960. Its totient is φ = 9299978496.

The previous prime is 11531255513. The next prime is 11531255557. The reversal of 11531255533 is 33555213511.

It is a cyclic number.

It is not a de Polignac number, because 11531255533 - 2¹⁷ = 11531124461 is a prime.

It is a super-2 number, since 2×11531255533² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531255503) 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, 509308 + ... + 531466.

It is an arithmetic number, because the mean of its divisors is an integer number (872350560).

Almost surely, 2^11531255533 is an apocalyptic number.

It is an amenable number.

11531255533 is a deficient number, since it is larger than the sum of its proper divisors (2426353427).

11531255533 is a wasteful number, since it uses less digits than its factorization.

11531255533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26556.

The product of its digits is 33750, while the sum is 34.

The spelling of 11531255533 in words is "eleven billion, five hundred thirty-one million, two hundred fifty-five thousand, five hundred thirty-three".