12815787647 has 6 divisors (see below), whose sum is σ = 13877450712. Its totient is φ = 11829957672.

The previous prime is 12815787617. The next prime is 12815787653. The reversal of 12815787647 is 74678751821.

It is not a de Polignac number, because 12815787647 - 2⁶ = 12815787583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12815787592 and 12815787601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815787617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37916363 + ... + 37916700.

It is an arithmetic number, because the mean of its divisors is an integer number (2312908452).

Almost surely, 2^12815787647 is an apocalyptic number.

12815787647 is a deficient number, since it is larger than the sum of its proper divisors (1061663065).

12815787647 is an equidigital number, since it uses as much as digits as its factorization.

12815787647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75833089 (or 75833076 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 56.

The spelling of 12815787647 in words is "twelve billion, eight hundred fifteen million, seven hundred eighty-seven thousand, six hundred forty-seven".