163640475617 has 2 divisors, whose sum is σ = 163640475618. Its totient is φ = 163640475616.

The previous prime is 163640475577. The next prime is 163640475637. The reversal of 163640475617 is 716574046361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145493422096 + 18147053521 = 381436^2 + 134711^2 .

It is an emirp because it is prime and its reverse (716574046361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163640475617 - 2¹⁰ = 163640474593 is a prime.

It is not a weakly prime, because it can be changed into another prime (163640475637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81820237808 + 81820237809.

It is an arithmetic number, because the mean of its divisors is an integer number (81820237809).

Almost surely, 2^163640475617 is an apocalyptic number.

It is an amenable number.

163640475617 is a deficient number, since it is larger than the sum of its proper divisors (1).

163640475617 is an equidigital number, since it uses as much as digits as its factorization.

163640475617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 50.

The spelling of 163640475617 in words is "one hundred sixty-three billion, six hundred forty million, four hundred seventy-five thousand, six hundred seventeen".