9661810645087 has 2 divisors, whose sum is σ = 9661810645088. Its totient is φ = 9661810645086.

The previous prime is 9661810645057. The next prime is 9661810645147. The reversal of 9661810645087 is 7805460181669.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9661810645087 - 2¹¹ = 9661810643039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661810645007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830905322543 + 4830905322544.

It is an arithmetic number, because the mean of its divisors is an integer number (4830905322544).

Almost surely, 2^{9661810645087} is an apocalyptic number.

9661810645087 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661810645087 is an equidigital number, since it uses as much as digits as its factorization.

9661810645087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 9661810645087 in words is "nine trillion, six hundred sixty-one billion, eight hundred ten million, six hundred forty-five thousand, eighty-seven".