684637204609 has 8 divisors (see below), whose sum is σ = 714564794880. Its totient is φ = 654723010656.

The previous prime is 684637204583. The next prime is 684637204633. The reversal of 684637204609 is 906402736486.

684637204609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684637204609 - 2³⁷ = 547198251137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684637204609.

It is not an unprimeable number, because it can be changed into a prime (684637204679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244564 + ... + 3449125.

It is an arithmetic number, because the mean of its divisors is an integer number (89320599360).

Almost surely, 2^684637204609 is an apocalyptic number.

It is an amenable number.

684637204609 is a deficient number, since it is larger than the sum of its proper divisors (29927590271).

684637204609 is a wasteful number, since it uses less digits than its factorization.

684637204609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698159.

The product of its (nonzero) digits is 10450944, while the sum is 55.

The spelling of 684637204609 in words is "six hundred eighty-four billion, six hundred thirty-seven million, two hundred four thousand, six hundred nine".