9661847551 has 2 divisors, whose sum is σ = 9661847552. Its totient is φ = 9661847550.

The previous prime is 9661847543. The next prime is 9661847561. The reversal of 9661847551 is 1557481669.

It is a weak prime.

It is an emirp because it is prime and its reverse (1557481669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9661847551 - 2³ = 9661847543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661847561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830923775 + 4830923776.

It is an arithmetic number, because the mean of its divisors is an integer number (4830923776).

Almost surely, 2^9661847551 is an apocalyptic number.

9661847551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661847551 is an equidigital number, since it uses as much as digits as its factorization.

9661847551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 9661847551 is about 98294.6974714303. The cubic root of 9661847551 is about 2129.8714574136.

The spelling of 9661847551 in words is "nine billion, six hundred sixty-one million, eight hundred forty-seven thousand, five hundred fifty-one".