646601808380 has 96 divisors (see below), whose sum is σ = 1504872165888. Its totient is φ = 231415315200.

The previous prime is 646601808283. The next prime is 646601808401. The reversal of 646601808380 is 83808106646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3606050 + ... + 3781110.

It is an arithmetic number, because the mean of its divisors is an integer number (15675751728).

Almost surely, 2^646601808380 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 646601808380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752436082944).

646601808380 is an abundant number, since it is smaller than the sum of its proper divisors (858270357508).

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

646601808380 is a wasteful number, since it uses less digits than its factorization.

646601808380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175347 (or 175345 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 646601808380 in words is "six hundred forty-six billion, six hundred one million, eight hundred eight thousand, three hundred eighty".