778888899999999 has 40 divisors (see below), whose sum is σ = 1252848878827920. Its totient is φ = 480431305499904.

The previous prime is 778888899999997. The next prime is 778888900000091. The reversal of 778888899999999 is 999999998888877.

778888899999999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 778888899999999 - 2¹ = 778888899999997 is a prime.

778888899999999 is a modest number, since divided by 99999999 gives 7788888 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 (778888899999997) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4793494204 + ... + 4793656689.

It is an arithmetic number, because the mean of its divisors is an integer number (31321221970698).

Almost surely, 2^{778888899999999} is an apocalyptic number.

778888899999999 is a deficient number, since it is larger than the sum of its proper divisors (473959978827921).

778888899999999 is a wasteful number, since it uses less digits than its factorization.

778888899999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9587150981 (or 9587150972 counting only the distinct ones).

The product of its digits is 69117192732672, while the sum is 126.

The spelling of 778888899999999 in words is "seven hundred seventy-eight trillion, eight hundred eighty-eight billion, eight hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".