84871001785 has 4 divisors (see below), whose sum is σ = 101845202148. Its totient is φ = 67896801424.

The previous prime is 84871001779. The next prime is 84871001861. The reversal of 84871001785 is 58710017848.

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 24089523264 + 60781478521 = 155208^2 + 246539^2 .

It is a cyclic number.

It is not a de Polignac number, because 84871001785 - 2¹³ = 84870993593 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8487100174 + ... + 8487100183.

It is an arithmetic number, because the mean of its divisors is an integer number (25461300537).

Almost surely, 2^84871001785 is an apocalyptic number.

It is an amenable number.

84871001785 is a deficient number, since it is larger than the sum of its proper divisors (16974200363).

84871001785 is a wasteful number, since it uses less digits than its factorization.

84871001785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974200362.

The product of its (nonzero) digits is 501760, while the sum is 49.

The spelling of 84871001785 in words is "eighty-four billion, eight hundred seventy-one million, one thousand, seven hundred eighty-five".