12512613649 has 12 divisors (see below), whose sum is σ = 13429006444. Its totient is φ = 11655143424.

The previous prime is 12512613637. The next prime is 12512613653. The reversal of 12512613649 is 94631621521.

It can be written as a sum of positive squares in 6 ways, for example, as 13373649 + 12499240000 = 3657^2 + 111800^2 .

It is not a de Polignac number, because 12512613649 - 2⁷ = 12512613521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12512613679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195144 + ... + 251209.

Almost surely, 2^12512613649 is an apocalyptic number.

It is an amenable number.

12512613649 is a deficient number, since it is larger than the sum of its proper divisors (916392795).

12512613649 is an equidigital number, since it uses as much as digits as its factorization.

12512613649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446484 (or 446467 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The spelling of 12512613649 in words is "twelve billion, five hundred twelve million, six hundred thirteen thousand, six hundred forty-nine".