12594849521 has 4 divisors (see below), whose sum is σ = 12609615732. Its totient is φ = 12580083312.

The previous prime is 12594849481. The next prime is 12594849541.

12594849521 is nontrivially palindromic in base 10.

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 254083600 + 12340765921 = 15940^2 + 111089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12594849521 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 12594849521.

It is not an unprimeable number, because it can be changed into a prime (12594849541) 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, 7381826 + ... + 7383531.

It is an arithmetic number, because the mean of its divisors is an integer number (3152403933).

Almost surely, 2^12594849521 is an apocalyptic number.

It is an amenable number.

12594849521 is a deficient number, since it is larger than the sum of its proper divisors (14766211).

12594849521 is an equidigital number, since it uses as much as digits as its factorization.

12594849521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14766210.

The product of its digits is 1036800, while the sum is 50.

The spelling of 12594849521 in words is "twelve billion, five hundred ninety-four million, eight hundred forty-nine thousand, five hundred twenty-one".