163644265116391 has 2 divisors, whose sum is σ = 163644265116392. Its totient is φ = 163644265116390.

The previous prime is 163644265116379. The next prime is 163644265116457. The reversal of 163644265116391 is 193611562446361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163644265116391 - 2⁷ = 163644265116263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163644265116491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81822132558195 + 81822132558196.

It is an arithmetic number, because the mean of its divisors is an integer number (81822132558196).

Almost surely, 2^{163644265116391} is an apocalyptic number.

163644265116391 is a deficient number, since it is larger than the sum of its proper divisors (1).

163644265116391 is an equidigital number, since it uses as much as digits as its factorization.

163644265116391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 58.

The spelling of 163644265116391 in words is "one hundred sixty-three trillion, six hundred forty-four billion, two hundred sixty-five million, one hundred sixteen thousand, three hundred ninety-one".