8515540538 has 4 divisors (see below), whose sum is σ = 12773310810. Its totient is φ = 4257770268.

The previous prime is 8515540529. The next prime is 8515540549. The reversal of 8515540538 is 8350455158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8327110009 + 188430529 = 91253^2 + 13727^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128885133 + ... + 2128885136.

Almost surely, 2^8515540538 is an apocalyptic number.

8515540538 is a deficient number, since it is larger than the sum of its proper divisors (4257770272).

8515540538 is a wasteful number, since it uses less digits than its factorization.

8515540538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257770271.

The product of its (nonzero) digits is 480000, while the sum is 44.

The square root of 8515540538 is about 92279.6864862468. The cubic root of 8515540538 is about 2042.0705411239.

The spelling of 8515540538 in words is "eight billion, five hundred fifteen million, five hundred forty thousand, five hundred thirty-eight".