847008538561 has 2 divisors, whose sum is σ = 847008538562. Its totient is φ = 847008538560.

The previous prime is 847008538553. The next prime is 847008538591. The reversal of 847008538561 is 165835800748.

847008538561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662198827536 + 184809711025 = 813756^2 + 429895^2 .

It is a cyclic number.

It is not a de Polignac number, because 847008538561 - 2³ = 847008538553 is a prime.

It is not a weakly prime, because it can be changed into another prime (847008538591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423504269280 + 423504269281.

It is an arithmetic number, because the mean of its divisors is an integer number (423504269281).

Almost surely, 2^847008538561 is an apocalyptic number.

It is an amenable number.

847008538561 is a deficient number, since it is larger than the sum of its proper divisors (1).

847008538561 is an equidigital number, since it uses as much as digits as its factorization.

847008538561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 847008538561 in words is "eight hundred forty-seven billion, eight million, five hundred thirty-eight thousand, five hundred sixty-one".