163306391225 has 6 divisors (see below), whose sum is σ = 202499925150. Its totient is φ = 130645112960.

The previous prime is 163306391203. The next prime is 163306391249. The reversal of 163306391225 is 522193603361.

It can be written as a sum of positive squares in 3 ways, for example, as 32809163689 + 130497227536 = 181133^2 + 361244^2 .

It is not a de Polignac number, because 163306391225 - 2¹⁸ = 163306129081 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3266127800 + ... + 3266127849.

It is an arithmetic number, because the mean of its divisors is an integer number (33749987525).

Almost surely, 2^163306391225 is an apocalyptic number.

It is an amenable number.

163306391225 is a deficient number, since it is larger than the sum of its proper divisors (39193533925).

163306391225 is an equidigital number, since it uses as much as digits as its factorization.

163306391225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532255659 (or 6532255654 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 41.

Adding to 163306391225 its reverse (522193603361), we get a palindrome (685499994586).

The spelling of 163306391225 in words is "one hundred sixty-three billion, three hundred six million, three hundred ninety-one thousand, two hundred twenty-five".