684340661472 has 384 divisors, whose sum is σ = 2005100697600. Its totient is φ = 203039391744.

The previous prime is 684340661467. The next prime is 684340661483. The reversal of 684340661472 is 274166043486.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2863349929 + ... + 2863350167.

It is an arithmetic number, because the mean of its divisors is an integer number (5221616400).

Almost surely, 2^684340661472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684340661472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002550348800).

684340661472 is an abundant number, since it is smaller than the sum of its proper divisors (1320760036128).

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

684340661472 is a wasteful number, since it uses less digits than its factorization.

684340661472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 684340661472 in words is "six hundred eighty-four billion, three hundred forty million, six hundred sixty-one thousand, four hundred seventy-two".