66498572880 has 120 divisors (see below), whose sum is σ = 223532454912. Its totient is φ = 17716430592.

The previous prime is 66498572867. The next prime is 66498572887. The reversal of 66498572880 is 8827589466.

66498572880 is a `hidden beast` number, since 66 + 498 + 5 + 7 + 2 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66498572887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 740157 + ... + 825123.

Almost surely, 2^66498572880 is an apocalyptic number.

66498572880 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 66498572880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111766227456).

66498572880 is an abundant number, since it is smaller than the sum of its proper divisors (157033882032).

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

66498572880 is a wasteful number, since it uses less digits than its factorization.

66498572880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86073 (or 86064 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 63.

The spelling of 66498572880 in words is "sixty-six billion, four hundred ninety-eight million, five hundred seventy-two thousand, eight hundred eighty".