97665000991 has 2 divisors, whose sum is σ = 97665000992. Its totient is φ = 97665000990.

The previous prime is 97665000967. The next prime is 97665001013. The reversal of 97665000991 is 19900056679.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97665000991 - 2⁹ = 97665000479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97665000911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48832500495 + 48832500496.

It is an arithmetic number, because the mean of its divisors is an integer number (48832500496).

Almost surely, 2^97665000991 is an apocalyptic number.

97665000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97665000991 is an equidigital number, since it uses as much as digits as its factorization.

97665000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 52.

The spelling of 97665000991 in words is "ninety-seven billion, six hundred sixty-five million, nine hundred ninety-one", and thus it is an aban number.