64316678438016 has 640 divisors, whose sum is σ = 204720521765760. Its totient is φ = 20000187187200.

The previous prime is 64316678438009. The next prime is 64316678438041. The reversal of 64316678438016 is 61083487661346.

64316678438016 is a `hidden beast` number, since 6 + 4 + 3 + 166 + 7 + 84 + 380 + 16 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1613665960 + ... + 1613705816.

It is an arithmetic number, because the mean of its divisors is an integer number (319875815259).

Almost surely, 2^{64316678438016} 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 64316678438016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102360260882880).

64316678438016 is an abundant number, since it is smaller than the sum of its proper divisors (140403843327744).

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

64316678438016 is a wasteful number, since it uses less digits than its factorization.

64316678438016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40074 (or 40053 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 64316678438016 in words is "sixty-four trillion, three hundred sixteen billion, six hundred seventy-eight million, four hundred thirty-eight thousand, sixteen".