12545254521 has 18 divisors (see below), whose sum is σ = 18623932782. Its totient is φ = 8137454400.

The previous prime is 12545254493. The next prime is 12545254543.

12545254521 is a `hidden beast` number, since 12 + 54 + 52 + 545 + 2 + 1 = 666.

12545254521 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 3 ways, for example, as 3394227600 + 9151026921 = 58260^2 + 95661^2 .

It is not a de Polignac number, because 12545254521 - 2⁶ = 12545254457 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12545254721) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 496780 + ... + 521421.

Almost surely, 2^12545254521 is an apocalyptic number.

It is an amenable number.

12545254521 is a deficient number, since it is larger than the sum of its proper divisors (6078678261).

12545254521 is a wasteful number, since it uses less digits than its factorization.

12545254521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018281 (or 1018241 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The spelling of 12545254521 in words is "twelve billion, five hundred forty-five million, two hundred fifty-four thousand, five hundred twenty-one".