778903999999 has 2 divisors, whose sum is σ = 778904000000. Its totient is φ = 778903999998.

The previous prime is 778903999981. The next prime is 778904000003. The reversal of 778903999999 is 999999309877.

It is a strong prime.

It is an emirp because it is prime and its reverse (999999309877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 778903999999 - 2¹¹ = 778903997951 is a prime.

778903999999 is a modest number, since divided by 999999 gives 778903 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778903999919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389451999999 + 389452000000.

It is an arithmetic number, because the mean of its divisors is an integer number (389452000000).

Almost surely, 2^778903999999 is an apocalyptic number.

778903999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

778903999999 is an equidigital number, since it uses as much as digits as its factorization.

778903999999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5624771544, while the sum is 88.

The spelling of 778903999999 in words is "seven hundred seventy-eight billion, nine hundred three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".