12563926881 has 16 divisors (see below), whose sum is σ = 18720531648. Its totient is φ = 7428780800.

The previous prime is 12563926877. The next prime is 12563926901. The reversal of 12563926881 is 18862936521.

It is a cyclic number.

It is not a de Polignac number, because 12563926881 - 2² = 12563926877 is a prime.

It is a super-2 number, since 2×12563926881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12563926831) 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, 4641636 + ... + 4644341.

It is an arithmetic number, because the mean of its divisors is an integer number (1170033228).

Almost surely, 2^12563926881 is an apocalyptic number.

12563926881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12563926881 is a deficient number, since it is larger than the sum of its proper divisors (6156604767).

12563926881 is a wasteful number, since it uses less digits than its factorization.

12563926881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9286032.

The product of its digits is 1244160, while the sum is 51.

The spelling of 12563926881 in words is "twelve billion, five hundred sixty-three million, nine hundred twenty-six thousand, eight hundred eighty-one".