8505138511 has 16 divisors (see below), whose sum is σ = 9065871360. Its totient is φ = 7956342720.

The previous prime is 8505138503. The next prime is 8505138553. The reversal of 8505138511 is 1158315058.

It is not a de Polignac number, because 8505138511 - 2³ = 8505138503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8505138911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488620 + ... + 505726.

It is an arithmetic number, because the mean of its divisors is an integer number (566616960).

Almost surely, 2^8505138511 is an apocalyptic number.

8505138511 is a deficient number, since it is larger than the sum of its proper divisors (560732849).

8505138511 is a wasteful number, since it uses less digits than its factorization.

8505138511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17454.

The product of its (nonzero) digits is 24000, while the sum is 37.

The square root of 8505138511 is about 92223.3078511067. The cubic root of 8505138511 is about 2041.2387157559.

The spelling of 8505138511 in words is "eight billion, five hundred five million, one hundred thirty-eight thousand, five hundred eleven".