97999668209 has 2 divisors, whose sum is σ = 97999668210. Its totient is φ = 97999668208.

The previous prime is 97999668203. The next prime is 97999668233. The reversal of 97999668209 is 90286699979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97019790400 + 979877809 = 311480^2 + 31303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97999668209 is a prime.

It is not a weakly prime, because it can be changed into another prime (97999668203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48999834104 + 48999834105.

It is an arithmetic number, because the mean of its divisors is an integer number (48999834105).

Almost surely, 2^97999668209 is an apocalyptic number.

It is an amenable number.

97999668209 is a deficient number, since it is larger than the sum of its proper divisors (1).

97999668209 is an equidigital number, since it uses as much as digits as its factorization.

97999668209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238085568, while the sum is 74.

The spelling of 97999668209 in words is "ninety-seven billion, nine hundred ninety-nine million, six hundred sixty-eight thousand, two hundred nine".