999999000779 has 2 divisors, whose sum is σ = 999999000780. Its totient is φ = 999999000778.

The previous prime is 999999000769. The next prime is 999999000811. The reversal of 999999000779 is 977000999999.

It is a happy number.

999999000779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (977000999999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999000779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (999999000709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999500389 + 499999500390.

It is an arithmetic number, because the mean of its divisors is an integer number (499999500390).

Almost surely, 2^999999000779 is an apocalyptic number.

999999000779 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999000779 is an equidigital number, since it uses as much as digits as its factorization.

999999000779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 234365481, while the sum is 77.

The spelling of 999999000779 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, seven hundred seventy-nine", and thus it is an aban number.