8663155121 has 4 divisors (see below), whose sum is σ = 8826610932. Its totient is φ = 8499699312.

The previous prime is 8663155117. The next prime is 8663155187. The reversal of 8663155121 is 1215513668.

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 4686087025 + 3977068096 = 68455^2 + 63064^2 .

It is a cyclic number.

It is not a de Polignac number, because 8663155121 - 2² = 8663155117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8663145121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81727826 + ... + 81727931.

It is an arithmetic number, because the mean of its divisors is an integer number (2206652733).

Almost surely, 2^8663155121 is an apocalyptic number.

It is an amenable number.

8663155121 is a deficient number, since it is larger than the sum of its proper divisors (163455811).

8663155121 is a wasteful number, since it uses less digits than its factorization.

8663155121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163455810.

The product of its digits is 43200, while the sum is 38.

The square root of 8663155121 is about 93076.0716886999. The cubic root of 8663155121 is about 2053.8025888536.

Adding to 8663155121 its reverse (1215513668), we get a palindrome (9878668789).

The spelling of 8663155121 in words is "eight billion, six hundred sixty-three million, one hundred fifty-five thousand, one hundred twenty-one".