47820768509 has 2 divisors, whose sum is σ = 47820768510. Its totient is φ = 47820768508.

The previous prime is 47820768491. The next prime is 47820768517. The reversal of 47820768509 is 90586702874.

47820768509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47784648409 + 36120100 = 218597^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 47820768509 - 2¹² = 47820764413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47820768539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23910384254 + 23910384255.

It is an arithmetic number, because the mean of its divisors is an integer number (23910384255).

Almost surely, 2^47820768509 is an apocalyptic number.

It is an amenable number.

47820768509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47820768509 is an equidigital number, since it uses as much as digits as its factorization.

47820768509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 47820768509 in words is "forty-seven billion, eight hundred twenty million, seven hundred sixty-eight thousand, five hundred nine".