99908868817 has 2 divisors, whose sum is σ = 99908868818. Its totient is φ = 99908868816.

The previous prime is 99908868809. The next prime is 99908868931. The reversal of 99908868817 is 71886880999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53377633296 + 46531235521 = 231036^2 + 215711^2 .

It is a cyclic number.

It is not a de Polignac number, because 99908868817 - 2³ = 99908868809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99908868817.

It is not a weakly prime, because it can be changed into another prime (99908868317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49954434408 + 49954434409.

It is an arithmetic number, because the mean of its divisors is an integer number (49954434409).

Almost surely, 2^99908868817 is an apocalyptic number.

It is an amenable number.

99908868817 is a deficient number, since it is larger than the sum of its proper divisors (1).

99908868817 is an equidigital number, since it uses as much as digits as its factorization.

99908868817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 73.

The spelling of 99908868817 in words is "ninety-nine billion, nine hundred eight million, eight hundred sixty-eight thousand, eight hundred seventeen".