12571212517 has 4 divisors (see below), whose sum is σ = 12808405260. Its totient is φ = 12334019776.

The previous prime is 12571212487. The next prime is 12571212527. The reversal of 12571212517 is 71521217521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71521217521 = 13 ⋅5501632117.

It can be written as a sum of positive squares in 2 ways, for example, as 4685950116 + 7885262401 = 68454^2 + 88799^2 .

It is a cyclic number.

It is not a de Polignac number, because 12571212517 - 2²⁷ = 12436994789 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 (12571212527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118596292 + ... + 118596397.

It is an arithmetic number, because the mean of its divisors is an integer number (3202101315).

Almost surely, 2^12571212517 is an apocalyptic number.

It is an amenable number.

12571212517 is a deficient number, since it is larger than the sum of its proper divisors (237192743).

12571212517 is an equidigital number, since it uses as much as digits as its factorization.

12571212517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237192742.

The product of its digits is 9800, while the sum is 34.

The spelling of 12571212517 in words is "twelve billion, five hundred seventy-one million, two hundred twelve thousand, five hundred seventeen".