3865862793449 has 2 divisors, whose sum is σ = 3865862793450. Its totient is φ = 3865862793448.

The previous prime is 3865862793349. The next prime is 3865862793487. The reversal of 3865862793449 is 9443972685683.

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., 2678155161049 + 1187707632400 = 1636507^2 + 1089820^2 .

It is a cyclic number.

It is not a de Polignac number, because 3865862793449 - 2⁴⁰ = 2766351165673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3865862793349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932931396724 + 1932931396725.

It is an arithmetic number, because the mean of its divisors is an integer number (1932931396725).

Almost surely, 2^{3865862793449} is an apocalyptic number.

It is an amenable number.

3865862793449 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865862793449 is an equidigital number, since it uses as much as digits as its factorization.

3865862793449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881169920, while the sum is 74.

The spelling of 3865862793449 in words is "three trillion, eight hundred sixty-five billion, eight hundred sixty-two million, seven hundred ninety-three thousand, four hundred forty-nine".