8165533181 has 4 divisors (see below), whose sum is σ = 8793651132. Its totient is φ = 7537415232.

The previous prime is 8165533171. The next prime is 8165533193. The reversal of 8165533181 is 1813355618.

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 3559196281 + 4606336900 = 59659^2 + 67870^2 .

It is a cyclic number.

It is not a de Polignac number, because 8165533181 - 2¹⁴ = 8165516797 is a prime.

It is a super-3 number, since 3×8165533181³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8165533121) 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, 314058956 + ... + 314058981.

It is an arithmetic number, because the mean of its divisors is an integer number (2198412783).

Almost surely, 2^8165533181 is an apocalyptic number.

It is an amenable number.

8165533181 is a deficient number, since it is larger than the sum of its proper divisors (628117951).

8165533181 is a wasteful number, since it uses less digits than its factorization.

8165533181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628117950.

The product of its digits is 86400, while the sum is 41.

The square root of 8165533181 is about 90363.3398065831. The cubic root of 8165533181 is about 2013.7003674196.

Adding to 8165533181 its reverse (1813355618), we get a palindrome (9978888799).

The spelling of 8165533181 in words is "eight billion, one hundred sixty-five million, five hundred thirty-three thousand, one hundred eighty-one".