1865849161963 has 2 divisors, whose sum is σ = 1865849161964. Its totient is φ = 1865849161962.

The previous prime is 1865849161937. The next prime is 1865849161993. The reversal of 1865849161963 is 3691619485681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1865849161963 - 2³³ = 1857259227371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1865849161993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932924580981 + 932924580982.

It is an arithmetic number, because the mean of its divisors is an integer number (932924580982).

Almost surely, 2^{1865849161963} is an apocalyptic number.

1865849161963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865849161963 is an equidigital number, since it uses as much as digits as its factorization.

1865849161963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67184640, while the sum is 67.

The spelling of 1865849161963 in words is "one trillion, eight hundred sixty-five billion, eight hundred forty-nine million, one hundred sixty-one thousand, nine hundred sixty-three".