8163520253617 has 4 divisors (see below), whose sum is σ = 8191382097780. Its totient is φ = 8135658409456.

The previous prime is 8163520253611. The next prime is 8163520253621. The reversal of 8163520253617 is 7163520253618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6223408344976 + 1940111908641 = 2494676^2 + 1392879^2 .

It is a cyclic number.

It is not a de Polignac number, because 8163520253617 - 2¹¹ = 8163520251569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8163520253611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13930921642 + ... + 13930922227.

It is an arithmetic number, because the mean of its divisors is an integer number (2047845524445).

Almost surely, 2^{8163520253617} is an apocalyptic number.

It is an amenable number.

8163520253617 is a deficient number, since it is larger than the sum of its proper divisors (27861844163).

8163520253617 is a wasteful number, since it uses less digits than its factorization.

8163520253617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27861844162.

The product of its (nonzero) digits is 1814400, while the sum is 49.

Subtracting from 8163520253617 its reverse (7163520253618), we obtain a palindrome (999999999999).

The spelling of 8163520253617 in words is "eight trillion, one hundred sixty-three billion, five hundred twenty million, two hundred fifty-three thousand, six hundred seventeen".