1865318400013 has 2 divisors, whose sum is σ = 1865318400014. Its totient is φ = 1865318400012.

The previous prime is 1865318399953. The next prime is 1865318400019. The reversal of 1865318400013 is 3100048135681.

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., 1704599193609 + 160719206404 = 1305603^2 + 400898^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865318400013 - 2¹⁷ = 1865318268941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1865318400019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932659200006 + 932659200007.

It is an arithmetic number, because the mean of its divisors is an integer number (932659200007).

Almost surely, 2^{1865318400013} is an apocalyptic number.

It is an amenable number.

1865318400013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865318400013 is an equidigital number, since it uses as much as digits as its factorization.

1865318400013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 1865318400013 in words is "one trillion, eight hundred sixty-five billion, three hundred eighteen million, four hundred thousand, thirteen".