66256560000 has 480 divisors, whose sum is σ = 248669712720. Its totient is φ = 16896000000.

The previous prime is 66256559989. The next prime is 66256560001. The reversal of 66256560000 is 6565266.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66256560001) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 16558000 + ... + 16562000.

Almost surely, 2^66256560000 is an apocalyptic number.

66256560000 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 66256560000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124334856360).

66256560000 is an abundant number, since it is smaller than the sum of its proper divisors (182413152720).

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

66256560000 is a wasteful number, since it uses less digits than its factorization.

66256560000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 66256560000 in words is "sixty-six billion, two hundred fifty-six million, five hundred sixty thousand".