12557923447 has 16 divisors (see below), whose sum is σ = 13099716000. Its totient is φ = 12023593344.

The previous prime is 12557923379. The next prime is 12557923481. The reversal of 12557923447 is 74432975521.

It is a cyclic number.

It is not a de Polignac number, because 12557923447 - 2¹⁵ = 12557890679 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 12557923447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557923487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5533429 + ... + 5535697.

It is an arithmetic number, because the mean of its divisors is an integer number (818732250).

Almost surely, 2^12557923447 is an apocalyptic number.

12557923447 is a deficient number, since it is larger than the sum of its proper divisors (541792553).

12557923447 is a wasteful number, since it uses less digits than its factorization.

12557923447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its digits is 2116800, while the sum is 49.

The spelling of 12557923447 in words is "twelve billion, five hundred fifty-seven million, nine hundred twenty-three thousand, four hundred forty-seven".