1866348893809 has 2 divisors, whose sum is σ = 1866348893810. Its totient is φ = 1866348893808.

The previous prime is 1866348893767. The next prime is 1866348893989. The reversal of 1866348893809 is 9083988436681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1691183207025 + 175165686784 = 1300455^2 + 418528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866348893809 - 2²⁹ = 1865812022897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1866348893609) 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, 933174446904 + 933174446905.

It is an arithmetic number, because the mean of its divisors is an integer number (933174446905).

Almost surely, 2^{1866348893809} is an apocalyptic number.

It is an amenable number.

1866348893809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866348893809 is an equidigital number, since it uses as much as digits as its factorization.

1866348893809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 429981696, while the sum is 73.

The spelling of 1866348893809 in words is "one trillion, eight hundred sixty-six billion, three hundred forty-eight million, eight hundred ninety-three thousand, eight hundred nine".