8519521867684 has 9 divisors (see below), whose sum is σ = 14909173484331. Its totient is φ = 4259758015020.

The previous prime is 8519521867639. The next prime is 8519521867733. The reversal of 8519521867684 is 4867681259158.

The square root of 8519521867684 is 2918822.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5107939 + ... + 6567349.

Almost surely, 2^{8519521867684} is an apocalyptic number.

8519521867684 is the 2918822-nd square number.

It is an amenable number.

8519521867684 is a deficient number, since it is larger than the sum of its proper divisors (6389651616647).

8519521867684 is an frugal number, since it uses more digits than its factorization.

8519521867684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918826 (or 1459413 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 70.

The spelling of 8519521867684 in words is "eight trillion, five hundred nineteen billion, five hundred twenty-one million, eight hundred sixty-seven thousand, six hundred eighty-four".