64544023530 has 384 divisors, whose sum is σ = 211598956800. Its totient is φ = 13920657408.

The previous prime is 64544023513. The next prime is 64544023541. The reversal of 64544023530 is 3532044546.

64544023530 is a `hidden beast` number, since 64 + 5 + 4 + 40 + 23 + 530 = 666.

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, 108842914 + ... + 108843506.

It is an arithmetic number, because the mean of its divisors is an integer number (551038950).

Almost surely, 2^64544023530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64544023530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105799478400).

64544023530 is an abundant number, since it is smaller than the sum of its proper divisors (147054933270).

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

64544023530 is a wasteful number, since it uses less digits than its factorization.

64544023530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

The spelling of 64544023530 in words is "sixty-four billion, five hundred forty-four million, twenty-three thousand, five hundred thirty".