999999000778 has 16 divisors (see below), whose sum is σ = 1603077018624. Its totient is φ = 466189746880.

The previous prime is 999999000769. The next prime is 999999000779. The reversal of 999999000778 is 877000999999.

It is not an unprimeable number, because it can be changed into a prime (999999000779) 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 in 7 ways as a sum of consecutive naturals, for example, 137434378 + ... + 137441653.

It is an arithmetic number, because the mean of its divisors is an integer number (100192313664).

Almost surely, 2^999999000778 is an apocalyptic number.

999999000778 is a deficient number, since it is larger than the sum of its proper divisors (603078017846).

999999000778 is a wasteful number, since it uses less digits than its factorization.

999999000778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274876157.

The product of its (nonzero) digits is 208324872, while the sum is 76.

The spelling of 999999000778 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, seven hundred seventy-eight", and thus it is an aban number.