64539644832 has 384 divisors, whose sum is σ = 215735788800. Its totient is φ = 18595381248.

The previous prime is 64539644821. The next prime is 64539644879. The reversal of 64539644832 is 23844693546.

64539644832 is a `hidden beast` number, since 6 + 4 + 539 + 64 + 48 + 3 + 2 = 666.

64539644832 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 (54).

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, 43343544 + ... + 43345032.

It is an arithmetic number, because the mean of its divisors is an integer number (561811950).

Almost surely, 2^64539644832 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 64539644832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107867894400).

64539644832 is an abundant number, since it is smaller than the sum of its proper divisors (151196143968).

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

64539644832 is a wasteful number, since it uses less digits than its factorization.

64539644832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765 (or 1751 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 54.

The spelling of 64539644832 in words is "sixty-four billion, five hundred thirty-nine million, six hundred forty-four thousand, eight hundred thirty-two".