12561387445 has 16 divisors (see below), whose sum is σ = 15883050240. Its totient is φ = 9510588864.

The previous prime is 12561387373. The next prime is 12561387479. The reversal of 12561387445 is 54478316521.

It is a cyclic number.

It is not a de Polignac number, because 12561387445 - 2¹⁹ = 12560863157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12561387395 and 12561387404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28404 + ... + 161026.

It is an arithmetic number, because the mean of its divisors is an integer number (992690640).

Almost surely, 2^12561387445 is an apocalyptic number.

It is an amenable number.

12561387445 is a deficient number, since it is larger than the sum of its proper divisors (3321662795).

12561387445 is a wasteful number, since it uses less digits than its factorization.

12561387445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133644.

The product of its digits is 806400, while the sum is 46.

The spelling of 12561387445 in words is "twelve billion, five hundred sixty-one million, three hundred eighty-seven thousand, four hundred forty-five".