99909960989 has 2 divisors, whose sum is σ = 99909960990. Its totient is φ = 99909960988.

The previous prime is 99909960973. The next prime is 99909961037. The reversal of 99909960989 is 98906990999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93835005625 + 6074955364 = 306325^2 + 77942^2 .

It is an emirp because it is prime and its reverse (98906990999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99909960989 - 2⁴ = 99909960973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99909990989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49954980494 + 49954980495.

It is an arithmetic number, because the mean of its divisors is an integer number (49954980495).

Almost surely, 2^99909960989 is an apocalyptic number.

It is an amenable number.

99909960989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99909960989 is an equidigital number, since it uses as much as digits as its factorization.

99909960989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229582512, while the sum is 77.

The spelling of 99909960989 in words is "ninety-nine billion, nine hundred nine million, nine hundred sixty thousand, nine hundred eighty-nine".