66508499520 has 224 divisors, whose sum is σ = 234831575040. Its totient is φ = 17720156160.

The previous prime is 66508499483. The next prime is 66508499527. The reversal of 66508499520 is 2599480566.

It is a happy number.

66508499520 is a `hidden beast` number, since 6 + 6 + 508 + 49 + 95 + 2 + 0 = 666.

66508499520 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 (54).

It is not an unprimeable number, because it can be changed into a prime (66508499527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12706824 + ... + 12712056.

Almost surely, 2^66508499520 is an apocalyptic number.

66508499520 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 66508499520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117415787520).

66508499520 is an abundant number, since it is smaller than the sum of its proper divisors (168323075520).

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

66508499520 is a wasteful number, since it uses less digits than its factorization.

66508499520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730 (or 6714 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 66508499520 in words is "sixty-six billion, five hundred eight million, four hundred ninety-nine thousand, five hundred twenty".