87850518205 has 4 divisors (see below), whose sum is σ = 105420621852. Its totient is φ = 70280414560.

The previous prime is 87850518137. The next prime is 87850518209. The reversal of 87850518205 is 50281505878.

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 55140902041 + 32709616164 = 234821^2 + 180858^2 .

It is a de Polignac number, because none of the positive numbers 2^k-87850518205 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 (87850518209) 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, 8785051816 + ... + 8785051825.

It is an arithmetic number, because the mean of its divisors is an integer number (26355155463).

Almost surely, 2^87850518205 is an apocalyptic number.

It is an amenable number.

87850518205 is a deficient number, since it is larger than the sum of its proper divisors (17570103647).

87850518205 is a wasteful number, since it uses less digits than its factorization.

87850518205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17570103646.

The product of its (nonzero) digits is 896000, while the sum is 49.

The spelling of 87850518205 in words is "eighty-seven billion, eight hundred fifty million, five hundred eighteen thousand, two hundred five".