778855955742 has 48 divisors (see below), whose sum is σ = 1761541977312. Its totient is φ = 248460903360.

The previous prime is 778855955707. The next prime is 778855955783. The reversal of 778855955742 is 247559558877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9545058 + ... + 9626309.

It is an arithmetic number, because the mean of its divisors is an integer number (36698791194).

Almost surely, 2^778855955742 is an apocalyptic number.

778855955742 is an abundant number, since it is smaller than the sum of its proper divisors (982686021570).

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

778855955742 is a wasteful number, since it uses less digits than its factorization.

778855955742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19171473 (or 19171470 counting only the distinct ones).

The product of its digits is 987840000, while the sum is 72.

The spelling of 778855955742 in words is "seven hundred seventy-eight billion, eight hundred fifty-five million, nine hundred fifty-five thousand, seven hundred forty-two".