99766789 has 2 divisors, whose sum is σ = 99766790. Its totient is φ = 99766788.

The previous prime is 99766741. The next prime is 99766861. The reversal of 99766789 is 98766799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 66564 = 9985^2 + 258^2 .

It is an emirp because it is prime and its reverse (98766799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99766789 - 2¹¹ = 99764741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99766729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49883394 + 49883395.

It is an arithmetic number, because the mean of its divisors is an integer number (49883395).

Almost surely, 2^99766789 is an apocalyptic number.

It is an amenable number.

99766789 is a deficient number, since it is larger than the sum of its proper divisors (1).

99766789 is an equidigital number, since it uses as much as digits as its factorization.

99766789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 61.

The square root of 99766789 is about 9988.3326436398. The cubic root of 99766789 is about 463.7977793130.

The spelling of 99766789 in words is "ninety-nine million, seven hundred sixty-six thousand, seven hundred eighty-nine".