163042351621 has 2 divisors, whose sum is σ = 163042351622. Its totient is φ = 163042351620.

The previous prime is 163042351603. The next prime is 163042351627. The reversal of 163042351621 is 126153240361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145190719521 + 17851632100 = 381039^2 + 133610^2 .

It is a cyclic number.

It is not a de Polignac number, because 163042351621 - 2³³ = 154452417029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163042351627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81521175810 + 81521175811.

It is an arithmetic number, because the mean of its divisors is an integer number (81521175811).

Almost surely, 2^163042351621 is an apocalyptic number.

It is an amenable number.

163042351621 is a deficient number, since it is larger than the sum of its proper divisors (1).

163042351621 is an equidigital number, since it uses as much as digits as its factorization.

163042351621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 163042351621 its reverse (126153240361), we get a palindrome (289195591982).

The spelling of 163042351621 in words is "one hundred sixty-three billion, forty-two million, three hundred fifty-one thousand, six hundred twenty-one".