99717066989 has 2 divisors, whose sum is σ = 99717066990. Its totient is φ = 99717066988.

The previous prime is 99717066959. The next prime is 99717067001. The reversal of 99717066989 is 98966071799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65169410089 + 34547656900 = 255283^2 + 185870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99717066989 is a prime.

It is a super-2 number, since 2×99717066989² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99717066919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49858533494 + 49858533495.

It is an arithmetic number, because the mean of its divisors is an integer number (49858533495).

Almost surely, 2^99717066989 is an apocalyptic number.

It is an amenable number.

99717066989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99717066989 is an equidigital number, since it uses as much as digits as its factorization.

99717066989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92588832, while the sum is 71.

The spelling of 99717066989 in words is "ninety-nine billion, seven hundred seventeen million, sixty-six thousand, nine hundred eighty-nine".