664206507216 has 240 divisors, whose sum is σ = 2298876862464. Its totient is φ = 181522104192.

The previous prime is 664206507163. The next prime is 664206507299. The reversal of 664206507216 is 612705602466.

664206507216 is a `hidden beast` number, since 6 + 6 + 420 + 6 + 5 + 0 + 7 + 216 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95425 + ... + 1156511.

Almost surely, 2^664206507216 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 664206507216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149438431232).

664206507216 is an abundant number, since it is smaller than the sum of its proper divisors (1634670355248).

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

664206507216 is a wasteful number, since it uses less digits than its factorization.

664206507216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061140 (or 1061122 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 664206507216 in words is "six hundred sixty-four billion, two hundred six million, five hundred seven thousand, two hundred sixteen".