778461553847 has 4 divisors (see below), whose sum is σ = 797448421056. Its totient is φ = 759474686640.

The previous prime is 778461553841. The next prime is 778461553861. The reversal of 778461553847 is 748355164877.

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

It is a cyclic number.

It is not a de Polignac number, because 778461553847 - 2¹⁰ = 778461552823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778461553841) 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, 9493433543 + ... + 9493433624.

It is an arithmetic number, because the mean of its divisors is an integer number (199362105264).

Almost surely, 2^778461553847 is an apocalyptic number.

778461553847 is a deficient number, since it is larger than the sum of its proper divisors (18986867209).

778461553847 is a wasteful number, since it uses less digits than its factorization.

778461553847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18986867208.

The product of its digits is 158054400, while the sum is 65.

The spelling of 778461553847 in words is "seven hundred seventy-eight billion, four hundred sixty-one million, five hundred fifty-three thousand, eight hundred forty-seven".