12981765447 has 48 divisors (see below), whose sum is σ = 22928056320. Its totient is φ = 6912475200.

The previous prime is 12981765439. The next prime is 12981765449. The reversal of 12981765447 is 74456718921.

12981765447 is a `hidden beast` number, since 1 + 2 + 98 + 1 + 7 + 6 + 544 + 7 = 666.

It is not a de Polignac number, because 12981765447 - 2³ = 12981765439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12981765393 and 12981765402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981765449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15879 + ... + 161912.

It is an arithmetic number, because the mean of its divisors is an integer number (477667840).

Almost surely, 2^12981765447 is an apocalyptic number.

12981765447 is a deficient number, since it is larger than the sum of its proper divisors (9946290873).

12981765447 is a wasteful number, since it uses less digits than its factorization.

12981765447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177884 (or 177881 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 12981765447 in words is "twelve billion, nine hundred eighty-one million, seven hundred sixty-five thousand, four hundred forty-seven".