778987331713 has 4 divisors (see below), whose sum is σ = 785881025028. Its totient is φ = 772093638400.

The previous prime is 778987331701. The next prime is 778987331719. The reversal of 778987331713 is 317133789877.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 294358332304 + 484628999409 = 542548^2 + 696153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778987331713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778987331719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446846488 + ... + 3446846713.

It is an arithmetic number, because the mean of its divisors is an integer number (196470256257).

Almost surely, 2^778987331713 is an apocalyptic number.

It is an amenable number.

778987331713 is a deficient number, since it is larger than the sum of its proper divisors (6893693315).

778987331713 is a wasteful number, since it uses less digits than its factorization.

778987331713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893693314.

The product of its digits is 37340352, while the sum is 64.

The spelling of 778987331713 in words is "seven hundred seventy-eight billion, nine hundred eighty-seven million, three hundred thirty-one thousand, seven hundred thirteen".