3806778728171 has 2 divisors, whose sum is σ = 3806778728172. Its totient is φ = 3806778728170.

The previous prime is 3806778728153. The next prime is 3806778728189. The reversal of 3806778728171 is 1718278776083.

3806778728171 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (3806778728153) and next prime (3806778728189).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3806778728171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3806778728098 and 3806778728107.

It is not a weakly prime, because it can be changed into another prime (3806778728111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1903389364085 + 1903389364086.

It is an arithmetic number, because the mean of its divisors is an integer number (1903389364086).

Almost surely, 2^{3806778728171} is an apocalyptic number.

3806778728171 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806778728171 is an equidigital number, since it uses as much as digits as its factorization.

3806778728171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44255232, while the sum is 65.

The spelling of 3806778728171 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, seven hundred twenty-eight thousand, one hundred seventy-one".