163442215561 has 2 divisors, whose sum is σ = 163442215562. Its totient is φ = 163442215560.

The previous prime is 163442215513. The next prime is 163442215567. The reversal of 163442215561 is 165512244361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142624054336 + 20818161225 = 377656^2 + 144285^2 .

It is an emirp because it is prime and its reverse (165512244361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163442215561 is a prime.

It is not a weakly prime, because it can be changed into another prime (163442215567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81721107780 + 81721107781.

It is an arithmetic number, because the mean of its divisors is an integer number (81721107781).

Almost surely, 2^163442215561 is an apocalyptic number.

It is an amenable number.

163442215561 is a deficient number, since it is larger than the sum of its proper divisors (1).

163442215561 is an equidigital number, since it uses as much as digits as its factorization.

163442215561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The spelling of 163442215561 in words is "one hundred sixty-three billion, four hundred forty-two million, two hundred fifteen thousand, five hundred sixty-one".