3806778555855 has 64 divisors (see below), whose sum is σ = 7582379673600. Its totient is φ = 1795826712960.

The previous prime is 3806778555841. The next prime is 3806778555889. The reversal of 3806778555855 is 5585558776083.

3806778555855 is a `hidden beast` number, since 3 + 8 + 0 + 67 + 7 + 8 + 5 + 558 + 5 + 5 = 666.

It is not a de Polignac number, because 3806778555855 - 2²⁷ = 3806644338127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34586775 + ... + 34696664.

It is an arithmetic number, because the mean of its divisors is an integer number (118474682400).

Almost surely, 2^{3806778555855} is an apocalyptic number.

3806778555855 is a deficient number, since it is larger than the sum of its proper divisors (3775601117745).

3806778555855 is a wasteful number, since it uses less digits than its factorization.

3806778555855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69283501 (or 69283495 counting only the distinct ones).

The product of its (nonzero) digits is 1411200000, while the sum is 72.

The spelling of 3806778555855 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, five hundred fifty-five thousand, eight hundred fifty-five".