12051271765 has 16 divisors (see below), whose sum is σ = 15599244528. Its totient is φ = 8884947456.

The previous prime is 12051271747. The next prime is 12051271769. The reversal of 12051271765 is 56717215021.

It can be written as a sum of positive squares in 8 ways, for example, as 7877982564 + 4173289201 = 88758^2 + 64601^2 .

It is a cyclic number.

It is not a de Polignac number, because 12051271765 - 2⁵ = 12051271733 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 (12051271769) 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, 110142 + ... + 190351.

It is an arithmetic number, because the mean of its divisors is an integer number (974952783).

Almost surely, 2^12051271765 is an apocalyptic number.

It is an amenable number.

12051271765 is a deficient number, since it is larger than the sum of its proper divisors (3547972763).

12051271765 is a wasteful number, since it uses less digits than its factorization.

12051271765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301128.

The product of its (nonzero) digits is 29400, while the sum is 37.

Adding to 12051271765 its reverse (56717215021), we get a palindrome (68768486786).

The spelling of 12051271765 in words is "twelve billion, fifty-one million, two hundred seventy-one thousand, seven hundred sixty-five".