12831445665 has 96 divisors (see below), whose sum is σ = 22954932000. Its totient is φ = 6628884480.

The previous prime is 12831445651. The next prime is 12831445667. The reversal of 12831445665 is 56654413821.

12831445665 is a `hidden beast` number, since 1 + 2 + 83 + 1 + 4 + 4 + 566 + 5 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 8442118161 + 4389327504 = 91881^2 + 66252^2 .

It is not a de Polignac number, because 12831445665 - 2¹⁰ = 12831444641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12831445665.

It is not an unprimeable number, because it can be changed into a prime (12831445667) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70891875 + ... + 70892055.

It is an arithmetic number, because the mean of its divisors is an integer number (239113875).

Almost surely, 2^12831445665 is an apocalyptic number.

12831445665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12831445665 is a deficient number, since it is larger than the sum of its proper divisors (10123486335).

12831445665 is a wasteful number, since it uses less digits than its factorization.

12831445665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 544 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 12831445665 in words is "twelve billion, eight hundred thirty-one million, four hundred forty-five thousand, six hundred sixty-five".