3806778555889 has 2 divisors, whose sum is σ = 3806778555890. Its totient is φ = 3806778555888.

The previous prime is 3806778555841. The next prime is 3806778555893. The reversal of 3806778555889 is 9885558776083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3799509288289 + 7269267600 = 1949233^2 + 85260^2 .

It is a cyclic number.

It is not a de Polignac number, because 3806778555889 - 2³¹ = 3804631072241 is a prime.

It is not a weakly prime, because it can be changed into another prime (3806778555809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1903389277944 + 1903389277945.

It is an arithmetic number, because the mean of its divisors is an integer number (1903389277945).

Almost surely, 2^{3806778555889} is an apocalyptic number.

It is an amenable number.

3806778555889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806778555889 is an equidigital number, since it uses as much as digits as its factorization.

3806778555889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256000, while the sum is 79.

The spelling of 3806778555889 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, five hundred fifty-five thousand, eight hundred eighty-nine".