684845622916 has 81 divisors (see below), whose sum is σ = 1509973816869. Its totient is φ = 270868354848.

The previous prime is 684845622893. The next prime is 684845622941. The reversal of 684845622916 is 619226548486.

It is a happy number.

The square root of 684845622916 is 827554.

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

It can be written as a sum of positive squares in only one way, i.e., 101308524100 + 583537098816 = 318290^2 + 763896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 150612555 + ... + 150617101.

Almost surely, 2^684845622916 is an apocalyptic number.

684845622916 is the 827554-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684845622916

684845622916 is an abundant number, since it is smaller than the sum of its proper divisors (825128193953).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684845622916 is an equidigital number, since it uses as much as digits as its factorization.

684845622916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138 (or 4569 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 61.

The spelling of 684845622916 in words is "six hundred eighty-four billion, eight hundred forty-five million, six hundred twenty-two thousand, nine hundred sixteen".