99664171 has 2 divisors, whose sum is σ = 99664172. Its totient is φ = 99664170.

The previous prime is 99664091. The next prime is 99664181. The reversal of 99664171 is 17146699.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99664171 - 2⁹ = 99663659 is a prime.

It is a super-4 number, since 4×99664171⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (99664181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49832085 + 49832086.

It is an arithmetic number, because the mean of its divisors is an integer number (49832086).

Almost surely, 2^99664171 is an apocalyptic number.

99664171 is a deficient number, since it is larger than the sum of its proper divisors (1).

99664171 is an equidigital number, since it uses as much as digits as its factorization.

99664171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 99664171 is about 9983.1944286386. The cubic root of 99664171 is about 463.6387072464.

The spelling of 99664171 in words is "ninety-nine million, six hundred sixty-four thousand, one hundred seventy-one".