87217685543 has 4 divisors (see below), whose sum is σ = 89344946208. Its totient is φ = 85090424880.

The previous prime is 87217685521. The next prime is 87217685549. The reversal of 87217685543 is 34558671278.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87217685543 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 (87217685549) 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, 1063630271 + ... + 1063630352.

It is an arithmetic number, because the mean of its divisors is an integer number (22336236552).

Almost surely, 2^87217685543 is an apocalyptic number.

87217685543 is a deficient number, since it is larger than the sum of its proper divisors (2127260665).

87217685543 is a wasteful number, since it uses less digits than its factorization.

87217685543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127260664.

The product of its digits is 11289600, while the sum is 56.

The spelling of 87217685543 in words is "eighty-seven billion, two hundred seventeen million, six hundred eighty-five thousand, five hundred forty-three".