12665001205 has 8 divisors (see below), whose sum is σ = 15206450904. Its totient is φ = 10126368000.

The previous prime is 12665001203. The next prime is 12665001227. The reversal of 12665001205 is 50210056621.

It can be written as a sum of positive squares in 4 ways, for example, as 315346564 + 12349654641 = 17758^2 + 111129^2 .

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

It is not a de Polignac number, because 12665001205 - 2¹ = 12665001203 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 (12665001203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694216 + ... + 712225.

It is an arithmetic number, because the mean of its divisors is an integer number (1900806363).

Almost surely, 2^12665001205 is an apocalyptic number.

It is an amenable number.

12665001205 is a deficient number, since it is larger than the sum of its proper divisors (2541449699).

12665001205 is a wasteful number, since it uses less digits than its factorization.

12665001205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408247.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 12665001205 its reverse (50210056621), we get a palindrome (62875057826).

The spelling of 12665001205 in words is "twelve billion, six hundred sixty-five million, one thousand, two hundred five".