84194789717 has 4 divisors (see below), whose sum is σ = 84245602956. Its totient is φ = 84143976480.

The previous prime is 84194789711. The next prime is 84194789771. The reversal of 84194789717 is 71798749148.

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 61451435236 + 22743354481 = 247894^2 + 150809^2 .

It is a cyclic number.

It is not a de Polignac number, because 84194789717 - 2²⁰ = 84193741141 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 (84194789711) 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, 25404134 + ... + 25407447.

It is an arithmetic number, because the mean of its divisors is an integer number (21061400739).

Almost surely, 2^84194789717 is an apocalyptic number.

It is an amenable number.

84194789717 is a deficient number, since it is larger than the sum of its proper divisors (50813239).

84194789717 is a wasteful number, since it uses less digits than its factorization.

84194789717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50813238.

The product of its digits is 28449792, while the sum is 65.

The spelling of 84194789717 in words is "eighty-four billion, one hundred ninety-four million, seven hundred eighty-nine thousand, seven hundred seventeen".