87166170641687 has 4 divisors (see below), whose sum is σ = 87179063145216. Its totient is φ = 87153278138160.

The previous prime is 87166170641681. The next prime is 87166170641729. The reversal of 87166170641687 is 78614607166178.

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

It is a cyclic number.

It is not a de Polignac number, because 87166170641687 - 2¹⁰ = 87166170640663 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 (87166170641681) 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, 6446241623 + ... + 6446255144.

It is an arithmetic number, because the mean of its divisors is an integer number (21794765786304).

Almost surely, 2^{87166170641687} is an apocalyptic number.

87166170641687 is a deficient number, since it is larger than the sum of its proper divisors (12892503529).

87166170641687 is a wasteful number, since it uses less digits than its factorization.

87166170641687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12892503528.

The product of its (nonzero) digits is 113799168, while the sum is 68.

The spelling of 87166170641687 in words is "eighty-seven trillion, one hundred sixty-six billion, one hundred seventy million, six hundred forty-one thousand, six hundred eighty-seven".