778899999999999 has 8 divisors (see below), whose sum is σ = 1038567766441392. Its totient is φ = 519249450112640.

The previous prime is 778899999999973. The next prime is 778900000000007. The reversal of 778899999999999 is 999999999998877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 778899999999999 - 2⁷ = 778899999999871 is a prime.

It is a super-9 number, since 9×778899999999999⁹ (a number of 135 digits) contains 999999999 as substring.

778899999999999 is a modest number, since divided by 99999999 gives 7788999 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778899999999949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4304032944 + ... + 4304213909.

It is an arithmetic number, because the mean of its divisors is an integer number (129820970805174).

Almost surely, 2^{778899999999999} is an apocalyptic number.

778899999999999 is a deficient number, since it is larger than the sum of its proper divisors (259667766441393).

778899999999999 is a wasteful number, since it uses less digits than its factorization.

778899999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608277017.

The product of its digits is 98411002933824, while the sum is 129.

The spelling of 778899999999999 in words is "seven hundred seventy-eight trillion, eight hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".