3806778555893 has 2 divisors, whose sum is σ = 3806778555894. Its totient is φ = 3806778555892.

The previous prime is 3806778555889. The next prime is 3806778556027. The reversal of 3806778555893 is 3985558776083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2604198745009 + 1202579810884 = 1613753^2 + 1096622^2 .

It is a cyclic number.

It is not a de Polignac number, because 3806778555893 - 2² = 3806778555889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3806778555893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3806778552893) by changing a digit.

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 as a sum of consecutive naturals, namely, 1903389277946 + 1903389277947.

It is an arithmetic number, because the mean of its divisors is an integer number (1903389277947).

Almost surely, 2^{3806778555893} is an apocalyptic number.

It is an amenable number.

3806778555893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806778555893 is an equidigital number, since it uses as much as digits as its factorization.

3806778555893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096000, while the sum is 74.

The spelling of 3806778555893 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, five hundred fifty-five thousand, eight hundred ninety-three".