99664777 has 2 divisors, whose sum is σ = 99664778. Its totient is φ = 99664776.

The previous prime is 99664753. The next prime is 99664801. The reversal of 99664777 is 77746699.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (99664753) and next prime (99664801).

It can be written as a sum of positive squares in only one way, i.e., 83832336 + 15832441 = 9156^2 + 3979^2 .

It is an emirp because it is prime and its reverse (77746699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99664777 - 2²³ = 91276169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99664277) 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, 49832388 + 49832389.

It is an arithmetic number, because the mean of its divisors is an integer number (49832389).

Almost surely, 2^99664777 is an apocalyptic number.

It is an amenable number.

99664777 is a deficient number, since it is larger than the sum of its proper divisors (1).

99664777 is an equidigital number, since it uses as much as digits as its factorization.

99664777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 55.

The square root of 99664777 is about 9983.2247795990. The cubic root of 99664777 is about 463.6396469505.

The spelling of 99664777 in words is "ninety-nine million, six hundred sixty-four thousand, seven hundred seventy-seven".