664834285040 has 320 divisors, whose sum is σ = 1836036771840. Its totient is φ = 221972889600.

The previous prime is 664834285039. The next prime is 664834285103. The reversal of 664834285040 is 40582438466.

It is a self number, because there is not a number n which added to its sum of digits gives 664834285040.

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, 27921140 + ... + 27944940.

It is an arithmetic number, because the mean of its divisors is an integer number (5737614912).

Almost surely, 2^664834285040 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 664834285040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (918018385920).

664834285040 is an abundant number, since it is smaller than the sum of its proper divisors (1171202486800).

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

664834285040 is a wasteful number, since it uses less digits than its factorization.

664834285040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23920 (or 23914 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 50.

The spelling of 664834285040 in words is "six hundred sixty-four billion, eight hundred thirty-four million, two hundred eighty-five thousand, forty".