3806778726686 has 16 divisors (see below), whose sum is σ = 6161637281184. Its totient is φ = 1753481799264.

The previous prime is 3806778726671. The next prime is 3806778726701. The reversal of 3806778726686 is 6866278776083.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3806778726671) and next prime (3806778726701).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145528241 + ... + 145554396.

It is an arithmetic number, because the mean of its divisors is an integer number (385102330074).

Almost surely, 2^{3806778726686} is an apocalyptic number.

3806778726686 is a deficient number, since it is larger than the sum of its proper divisors (2354858554498).

3806778726686 is a wasteful number, since it uses less digits than its factorization.

3806778726686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291083155.

The product of its (nonzero) digits is 1365590016, while the sum is 74.

The spelling of 3806778726686 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, seven hundred twenty-six thousand, six hundred eighty-six".