163125305521 has 2 divisors, whose sum is σ = 163125305522. Its totient is φ = 163125305520.

The previous prime is 163125305503. The next prime is 163125305537. The reversal of 163125305521 is 125503521361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149738815521 + 13386490000 = 386961^2 + 115700^2 .

It is an emirp because it is prime and its reverse (125503521361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163125305521 - 2¹⁵ = 163125272753 is a prime.

It is not a weakly prime, because it can be changed into another prime (163125605521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81562652760 + 81562652761.

It is an arithmetic number, because the mean of its divisors is an integer number (81562652761).

Almost surely, 2^163125305521 is an apocalyptic number.

It is an amenable number.

163125305521 is a deficient number, since it is larger than the sum of its proper divisors (1).

163125305521 is an equidigital number, since it uses as much as digits as its factorization.

163125305521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 34.

Adding to 163125305521 its reverse (125503521361), we get a palindrome (288628826882).

The spelling of 163125305521 in words is "one hundred sixty-three billion, one hundred twenty-five million, three hundred five thousand, five hundred twenty-one".