64550520540 has 384 divisors, whose sum is σ = 225566208000. Its totient is φ = 15189350400.

The previous prime is 64550520539. The next prime is 64550520547. The reversal of 64550520540 is 4502505546.

64550520540 is a `hidden beast` number, since 6 + 4 + 550 + 52 + 0 + 54 + 0 = 666.

64550520540 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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 64550520495 and 64550520504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64550520547) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 58205506 + ... + 58206614.

It is an arithmetic number, because the mean of its divisors is an integer number (587412000).

Almost surely, 2^64550520540 is an apocalyptic number.

64550520540 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 64550520540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112783104000).

64550520540 is an abundant number, since it is smaller than the sum of its proper divisors (161015687460).

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

64550520540 is a wasteful number, since it uses less digits than its factorization.

64550520540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 64550520540 in words is "sixty-four billion, five hundred fifty million, five hundred twenty thousand, five hundred forty".