680218356840 has 256 divisors, whose sum is σ = 2433158922240. Its totient is φ = 150194688000.

The previous prime is 680218356833. The next prime is 680218356911. The reversal of 680218356840 is 48653812086.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206725 + ... + 1184555.

It is an arithmetic number, because the mean of its divisors is an integer number (9504527040).

Almost surely, 2^680218356840 is an apocalyptic number.

680218356840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680218356840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216579461120).

680218356840 is an abundant number, since it is smaller than the sum of its proper divisors (1752940565400).

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

680218356840 is a wasteful number, since it uses less digits than its factorization.

680218356840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977904 (or 977900 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 680218356840 in words is "six hundred eighty billion, two hundred eighteen million, three hundred fifty-six thousand, eight hundred forty".