12017436205 has 4 divisors (see below), whose sum is σ = 14420923452. Its totient is φ = 9613948960.

The previous prime is 12017436203. The next prime is 12017436227. The reversal of 12017436205 is 50263471021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50263471021 = 31 ⋅1621402291.

It can be written as a sum of positive squares in 2 ways, for example, as 7724827881 + 4292608324 = 87891^2 + 65518^2 .

It is not a de Polignac number, because 12017436205 - 2¹ = 12017436203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12017436203) 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, 1201743616 + ... + 1201743625.

It is an arithmetic number, because the mean of its divisors is an integer number (3605230863).

Almost surely, 2^12017436205 is an apocalyptic number.

It is an amenable number.

12017436205 is a deficient number, since it is larger than the sum of its proper divisors (2403487247).

12017436205 is an equidigital number, since it uses as much as digits as its factorization.

12017436205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403487246.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 12017436205 in words is "twelve billion, seventeen million, four hundred thirty-six thousand, two hundred five".