64644833160 has 768 divisors, whose sum is σ = 242937792000. Its totient is φ = 15445748736.

The previous prime is 64644833051. The next prime is 64644833207. The reversal of 64644833160 is 6133844646.

It is a happy number.

64644833160 is a `hidden beast` number, since 6 + 4 + 6 + 4 + 483 + 3 + 160 = 666.

64644833160 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 726346396 + ... + 726346484.

It is an arithmetic number, because the mean of its divisors is an integer number (316325250).

Almost surely, 2^64644833160 is an apocalyptic number.

64644833160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64644833160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121468896000).

64644833160 is an abundant number, since it is smaller than the sum of its proper divisors (178292958840).

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

64644833160 is a wasteful number, since it uses less digits than its factorization.

64644833160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 64644833160 in words is "sixty-four billion, six hundred forty-four million, eight hundred thirty-three thousand, one hundred sixty".