387666822217 has 2 divisors, whose sum is σ = 387666822218. Its totient is φ = 387666822216.

The previous prime is 387666822167. The next prime is 387666822233. The reversal of 387666822217 is 712228666783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386611611961 + 1055210256 = 621781^2 + 32484^2 .

It is a cyclic number.

It is not a de Polignac number, because 387666822217 - 2⁷ = 387666822089 is a prime.

It is not a weakly prime, because it can be changed into another prime (387666822287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193833411108 + 193833411109.

It is an arithmetic number, because the mean of its divisors is an integer number (193833411109).

Almost surely, 2^387666822217 is an apocalyptic number.

It is an amenable number.

387666822217 is a deficient number, since it is larger than the sum of its proper divisors (1).

387666822217 is an equidigital number, since it uses as much as digits as its factorization.

387666822217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 58.

The spelling of 387666822217 in words is "three hundred eighty-seven billion, six hundred sixty-six million, eight hundred twenty-two thousand, two hundred seventeen".