12695840447 has 2 divisors, whose sum is σ = 12695840448. Its totient is φ = 12695840446.

The previous prime is 12695840419. The next prime is 12695840537. The reversal of 12695840447 is 74404859621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12695840447 - 2⁸ = 12695840191 is a prime.

It is a super-2 number, since 2×12695840447² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12695840395 and 12695840404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12695846447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6347920223 + 6347920224.

It is an arithmetic number, because the mean of its divisors is an integer number (6347920224).

Almost surely, 2^12695840447 is an apocalyptic number.

12695840447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12695840447 is an equidigital number, since it uses as much as digits as its factorization.

12695840447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 12695840447 in words is "twelve billion, six hundred ninety-five million, eight hundred forty thousand, four hundred forty-seven".