84128080609 has 4 divisors (see below), whose sum is σ = 84128813316. Its totient is φ = 84127347904.

The previous prime is 84128080607. The next prime is 84128080667. The reversal of 84128080609 is 90608082148.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47217986209 + 36910094400 = 217297^2 + 192120^2 .

It is a cyclic number.

It is not a de Polignac number, because 84128080609 - 2¹ = 84128080607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84128080607) 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, 152524 + ... + 437629.

It is an arithmetic number, because the mean of its divisors is an integer number (21032203329).

Almost surely, 2^84128080609 is an apocalyptic number.

It is an amenable number.

84128080609 is a deficient number, since it is larger than the sum of its proper divisors (732707).

84128080609 is a wasteful number, since it uses less digits than its factorization.

84128080609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732706.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 84128080609 in words is "eighty-four billion, one hundred twenty-eight million, eighty thousand, six hundred nine".