12551372065 has 16 divisors (see below), whose sum is σ = 15223988880. Its totient is φ = 9933431040.

The previous prime is 12551372059. The next prime is 12551372069. The reversal of 12551372065 is 56027315521.

It can be written as a sum of positive squares in 8 ways, for example, as 286252561 + 12265119504 = 16919^2 + 110748^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12551372065 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12551372069) 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, 144855 + ... + 214675.

It is an arithmetic number, because the mean of its divisors is an integer number (951499305).

Almost surely, 2^12551372065 is an apocalyptic number.

It is an amenable number.

12551372065 is a deficient number, since it is larger than the sum of its proper divisors (2672616815).

12551372065 is a wasteful number, since it uses less digits than its factorization.

12551372065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70212.

The product of its (nonzero) digits is 63000, while the sum is 37.

Adding to 12551372065 its reverse (56027315521), we get a palindrome (68578687586).

The spelling of 12551372065 in words is "twelve billion, five hundred fifty-one million, three hundred seventy-two thousand, sixty-five".