778968655 has 8 divisors (see below), whose sum is σ = 934913232. Its totient is φ = 623074368.

The previous prime is 778968643. The next prime is 778968689. The reversal of 778968655 is 556869877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 778968655 - 2¹³ = 778960463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 778968593 and 778968602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48387 + ... + 62443.

It is an arithmetic number, because the mean of its divisors is an integer number (116864154).

Almost surely, 2^778968655 is an apocalyptic number.

778968655 is a deficient number, since it is larger than the sum of its proper divisors (155944577).

778968655 is a wasteful number, since it uses less digits than its factorization.

778968655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25145.

The product of its digits is 25401600, while the sum is 61.

The square root of 778968655 is about 27910.0099426711. The cubic root of 778968655 is about 920.1105156304.

The spelling of 778968655 in words is "seven hundred seventy-eight million, nine hundred sixty-eight thousand, six hundred fifty-five".