9856171431647 has 2 divisors, whose sum is σ = 9856171431648. Its totient is φ = 9856171431646.

The previous prime is 9856171431643. The next prime is 9856171431653. The reversal of 9856171431647 is 7461341716589.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9856171431647 - 2² = 9856171431643 is a prime.

It is a super-3 number, since 3×9856171431647³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9856171431647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9856171431643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4928085715823 + 4928085715824.

It is an arithmetic number, because the mean of its divisors is an integer number (4928085715824).

Almost surely, 2^{9856171431647} is an apocalyptic number.

9856171431647 is a deficient number, since it is larger than the sum of its proper divisors (1).

9856171431647 is an equidigital number, since it uses as much as digits as its factorization.

9856171431647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 62.

The spelling of 9856171431647 in words is "nine trillion, eight hundred fifty-six billion, one hundred seventy-one million, four hundred thirty-one thousand, six hundred forty-seven".