778431105606 has 320 divisors, whose sum is σ = 2057686843392. Its totient is φ = 194481000000.

The previous prime is 778431105563. The next prime is 778431105623. The reversal of 778431105606 is 606501134877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1036525731 + ... + 1036526481.

Almost surely, 2^778431105606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778431105606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028843421696).

778431105606 is an abundant number, since it is smaller than the sum of its proper divisors (1279255737786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778431105606 is a wasteful number, since it uses less digits than its factorization.

778431105606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 778431105606 in words is "seven hundred seventy-eight billion, four hundred thirty-one million, one hundred five thousand, six hundred six".