64999575872 has 224 divisors, whose sum is σ = 167246929920. Its totient is φ = 24323328000.

The previous prime is 64999575863. The next prime is 64999575913. The reversal of 64999575872 is 27857599946.

It is a tau number, because it is divible by the number of its divisors (224).

It is a junction number, because it is equal to n+sod(n) for n = 64999575796 and 64999575805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21233222 + ... + 21236282.

It is an arithmetic number, because the mean of its divisors is an integer number (746638080).

Almost surely, 2^64999575872 is an apocalyptic number.

64999575872 is a gapful number since it is divisible by the number (62) 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 64999575872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83623464960).

64999575872 is an abundant number, since it is smaller than the sum of its proper divisors (102247354048).

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

64999575872 is a wasteful number, since it uses less digits than its factorization.

64999575872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3251 counting only the distinct ones).

The product of its digits is 342921600, while the sum is 71.

The spelling of 64999575872 in words is "sixty-four billion, nine hundred ninety-nine million, five hundred seventy-five thousand, eight hundred seventy-two".