64550879520 has 384 divisors, whose sum is σ = 219469824000. Its totient is φ = 15890104320.

The previous prime is 64550879501. The next prime is 64550879527. The reversal of 64550879520 is 2597805546.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (64550879527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129360231 + ... + 129360729.

It is an arithmetic number, because the mean of its divisors is an integer number (571536000).

Almost surely, 2^64550879520 is an apocalyptic number.

64550879520 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 64550879520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109734912000).

64550879520 is an abundant number, since it is smaller than the sum of its proper divisors (154918944480).

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

64550879520 is a wasteful number, since it uses less digits than its factorization.

64550879520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 51.

The spelling of 64550879520 in words is "sixty-four billion, five hundred fifty million, eight hundred seventy-nine thousand, five hundred twenty".