778812999999 has 16 divisors (see below), whose sum is σ = 1043070019200. Its totient is φ = 516882838176.

The previous prime is 778812999983. The next prime is 778813000013. The reversal of 778812999999 is 999999218877.

It is not a de Polignac number, because 778812999999 - 2⁴ = 778812999983 is a prime.

778812999999 is a modest number, since divided by 999999 gives 778812 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778812999959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6493872 + ... + 6612714.

It is an arithmetic number, because the mean of its divisors is an integer number (65191876200).

Almost surely, 2^778812999999 is an apocalyptic number.

778812999999 is a deficient number, since it is larger than the sum of its proper divisors (264257019201).

778812999999 is a wasteful number, since it uses less digits than its factorization.

778812999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128614.

The product of its digits is 3333197952, while the sum is 87.

The spelling of 778812999999 in words is "seven hundred seventy-eight billion, eight hundred twelve million, nine hundred ninety-nine thousand, nine hundred ninety-nine".