640166841216 has 320 divisors, whose sum is σ = 2179222990560. Its totient is φ = 182742220800.

The previous prime is 640166841163. The next prime is 640166841239. The reversal of 640166841216 is 612148661046.

640166841216 is a `hidden beast` number, since 64 + 0 + 166 + 8 + 412 + 16 = 666.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 98772696 + ... + 98779176.

Almost surely, 2^640166841216 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 640166841216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1089611495280).

640166841216 is an abundant number, since it is smaller than the sum of its proper divisors (1539056149344).

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

640166841216 is a wasteful number, since it uses less digits than its factorization.

640166841216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875 (or 7854 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 640166841216 in words is "six hundred forty billion, one hundred sixty-six million, eight hundred forty-one thousand, two hundred sixteen".