12508594649 has 4 divisors (see below), whose sum is σ = 12539178420. Its totient is φ = 12478010880.

The previous prime is 12508594591. The next prime is 12508594667. The reversal of 12508594649 is 94649580521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7565520400 + 4943074249 = 86980^2 + 70307^2 .

It is a cyclic number.

It is not a de Polignac number, because 12508594649 - 2²⁴ = 12491817433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12508594649.

It is not an unprimeable number, because it can be changed into a prime (12508593649) 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, 15291272 + ... + 15292089.

It is an arithmetic number, because the mean of its divisors is an integer number (3134794605).

Almost surely, 2^12508594649 is an apocalyptic number.

It is an amenable number.

12508594649 is a deficient number, since it is larger than the sum of its proper divisors (30583771).

12508594649 is an equidigital number, since it uses as much as digits as its factorization.

12508594649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30583770.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 12508594649 in words is "twelve billion, five hundred eight million, five hundred ninety-four thousand, six hundred forty-nine".