778677078667 has 4 divisors (see below), whose sum is σ = 779947351840. Its totient is φ = 777406805496.

The previous prime is 778677078659. The next prime is 778677078691. The reversal of 778677078667 is 766870776877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766870776877 = 428401 ⋅1790077.

It is a cyclic number.

It is not a de Polignac number, because 778677078667 - 2³ = 778677078659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 778677078593 and 778677078602.

It is not an unprimeable number, because it can be changed into a prime (778677078467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635135667 + ... + 635136892.

It is an arithmetic number, because the mean of its divisors is an integer number (194986837960).

Almost surely, 2^778677078667 is an apocalyptic number.

778677078667 is a deficient number, since it is larger than the sum of its proper divisors (1270273173).

778677078667 is a wasteful number, since it uses less digits than its factorization.

778677078667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270273172.

The product of its (nonzero) digits is 1626379776, while the sum is 76.

The spelling of 778677078667 in words is "seven hundred seventy-eight billion, six hundred seventy-seven million, seventy-eight thousand, six hundred sixty-seven".