847471006561 has 2 divisors, whose sum is σ = 847471006562. Its totient is φ = 847471006560.

The previous prime is 847471006559. The next prime is 847471006589. The reversal of 847471006561 is 165600174748.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 592199507025 + 255271499536 = 769545^2 + 505244^2 .

It is a cyclic number.

It is not a de Polignac number, because 847471006561 - 2¹ = 847471006559 is a prime.

Together with 847471006559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (847471006541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423735503280 + 423735503281.

It is an arithmetic number, because the mean of its divisors is an integer number (423735503281).

Almost surely, 2^847471006561 is an apocalyptic number.

It is an amenable number.

847471006561 is a deficient number, since it is larger than the sum of its proper divisors (1).

847471006561 is an equidigital number, since it uses as much as digits as its factorization.

847471006561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 847471006561 in words is "eight hundred forty-seven billion, four hundred seventy-one million, six thousand, five hundred sixty-one".