8181505165 has 8 divisors (see below), whose sum is σ = 10334532960. Its totient is φ = 6200719632.

The previous prime is 8181505141. The next prime is 8181505177. The reversal of 8181505165 is 5615051818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8181505165 - 2¹⁷ = 8181374093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43060459 + ... + 43060648.

It is an arithmetic number, because the mean of its divisors is an integer number (1291816620).

Almost surely, 2^8181505165 is an apocalyptic number.

It is an amenable number.

8181505165 is a deficient number, since it is larger than the sum of its proper divisors (2153027795).

8181505165 is a wasteful number, since it uses less digits than its factorization.

8181505165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86121131.

The product of its (nonzero) digits is 48000, while the sum is 40.

The square root of 8181505165 is about 90451.6730912148. The cubic root of 8181505165 is about 2015.0124614655.

The spelling of 8181505165 in words is "eight billion, one hundred eighty-one million, five hundred five thousand, one hundred sixty-five".