12546537965 has 16 divisors (see below), whose sum is σ = 17167753008. Its totient is φ = 8720126976.

The previous prime is 12546537947. The next prime is 12546538001. The reversal of 12546537965 is 56973564521.

It can be written as a sum of positive squares in 8 ways, for example, as 86174089 + 12460363876 = 9283^2 + 111626^2 .

It is a cyclic number.

It is not a de Polignac number, because 12546537965 - 2⁸ = 12546537709 is a prime.

It is a super-2 number, since 2×12546537965² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5676062 + ... + 5678271.

It is an arithmetic number, because the mean of its divisors is an integer number (1072984563).

Almost surely, 2^12546537965 is an apocalyptic number.

It is an amenable number.

12546537965 is a deficient number, since it is larger than the sum of its proper divisors (4621215043).

12546537965 is a wasteful number, since it uses less digits than its factorization.

12546537965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11354368.

The product of its digits is 6804000, while the sum is 53.

The spelling of 12546537965 in words is "twelve billion, five hundred forty-six million, five hundred thirty-seven thousand, nine hundred sixty-five".