76899995209 has 2 divisors, whose sum is σ = 76899995210. Its totient is φ = 76899995208.

The previous prime is 76899995189. The next prime is 76899995251. The reversal of 76899995209 is 90259999867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721405625 + 18178589584 = 242325^2 + 134828^2 .

It is an emirp because it is prime and its reverse (90259999867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76899995209 - 2¹¹ = 76899993161 is a prime.

It is not a weakly prime, because it can be changed into another prime (76899905209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38449997604 + 38449997605.

It is an arithmetic number, because the mean of its divisors is an integer number (38449997605).

Almost surely, 2^76899995209 is an apocalyptic number.

It is an amenable number.

76899995209 is a deficient number, since it is larger than the sum of its proper divisors (1).

76899995209 is an equidigital number, since it uses as much as digits as its factorization.

76899995209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198404640, while the sum is 73.

The spelling of 76899995209 in words is "seventy-six billion, eight hundred ninety-nine million, nine hundred ninety-five thousand, two hundred nine".