84216717505 has 4 divisors (see below), whose sum is σ = 101060061012. Its totient is φ = 67373374000.

The previous prime is 84216717443. The next prime is 84216717509. The reversal of 84216717505 is 50571761248.

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 9482280129 + 74734437376 = 97377^2 + 273376^2 .

It is a de Polignac number, because none of the positive numbers 2^k-84216717505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84216717509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8421671746 + ... + 8421671755.

It is an arithmetic number, because the mean of its divisors is an integer number (25265015253).

Almost surely, 2^84216717505 is an apocalyptic number.

It is an amenable number.

84216717505 is a deficient number, since it is larger than the sum of its proper divisors (16843343507).

84216717505 is a wasteful number, since it uses less digits than its factorization.

84216717505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16843343506.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 84216717505 in words is "eighty-four billion, two hundred sixteen million, seven hundred seventeen thousand, five hundred five".