99788968817 has 2 divisors, whose sum is σ = 99788968818. Its totient is φ = 99788968816.

The previous prime is 99788968801. The next prime is 99788968859. The reversal of 99788968817 is 71886988799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95928956176 + 3860012641 = 309724^2 + 62129^2 .

It is a cyclic number.

It is not a de Polignac number, because 99788968817 - 2⁴ = 99788968801 is a prime.

It is not a weakly prime, because it can be changed into another prime (99788964817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49894484408 + 49894484409.

It is an arithmetic number, because the mean of its divisors is an integer number (49894484409).

Almost surely, 2^99788968817 is an apocalyptic number.

It is an amenable number.

99788968817 is a deficient number, since it is larger than the sum of its proper divisors (1).

99788968817 is an equidigital number, since it uses as much as digits as its factorization.

99788968817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 877879296, while the sum is 80.

The spelling of 99788968817 in words is "ninety-nine billion, seven hundred eighty-eight million, nine hundred sixty-eight thousand, eight hundred seventeen".