11638310161 has 3 divisors (see below), whose sum is σ = 11638418043. Its totient is φ = 11638202280.

The previous prime is 11638310149. The next prime is 11638310183. The reversal of 11638310161 is 16101383611.

The square root of 11638310161 is 107881.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2854871761 + 8783438400 = 53431^2 + 93720^2 .

It is not a de Polignac number, because 11638310161 - 2¹¹ = 11638308113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11638310461) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 53941 + ... + 161821.

It is an arithmetic number, because the mean of its divisors is an integer number (3879472681).

Almost surely, 2^11638310161 is an apocalyptic number.

11638310161 is the 107881-st square number.

11638310161 is the 53941-st centered octagonal number.

It is an amenable number.

11638310161 is a deficient number, since it is larger than the sum of its proper divisors (107882).

11638310161 is an frugal number, since it uses more digits than its factorization.

11638310161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215762 (or 107881 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

Adding to 11638310161 its reverse (16101383611), we get a palindrome (27739693772).

The spelling of 11638310161 in words is "eleven billion, six hundred thirty-eight million, three hundred ten thousand, one hundred sixty-one".