12733536581 has 4 divisors (see below), whose sum is σ = 12864810252. Its totient is φ = 12602262912.

The previous prime is 12733536577. The next prime is 12733536593. The reversal of 12733536581 is 18563533721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8641375681 + 4092160900 = 92959^2 + 63970^2 .

It is a cyclic number.

It is not a de Polignac number, because 12733536581 - 2² = 12733536577 is a prime.

It is a super-2 number, since 2×12733536581² (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 (12733538581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65636690 + ... + 65636883.

It is an arithmetic number, because the mean of its divisors is an integer number (3216202563).

Almost surely, 2^12733536581 is an apocalyptic number.

It is an amenable number.

12733536581 is a deficient number, since it is larger than the sum of its proper divisors (131273671).

12733536581 is an equidigital number, since it uses as much as digits as its factorization.

12733536581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131273670.

The product of its digits is 453600, while the sum is 44.

The spelling of 12733536581 in words is "twelve billion, seven hundred thirty-three million, five hundred thirty-six thousand, five hundred eighty-one".