66713518080 has 640 divisors, whose sum is σ = 261490941360. Its totient is φ = 16137584640.

The previous prime is 66713518037. The next prime is 66713518093. The reversal of 66713518080 is 8081531766.

66713518080 is a `hidden beast` number, since 66 + 71 + 3 + 518 + 0 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×66713518080² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 145981212 + ... + 145981668.

Almost surely, 2^66713518080 is an apocalyptic number.

66713518080 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 66713518080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130745470680).

66713518080 is an abundant number, since it is smaller than the sum of its proper divisors (194777423280).

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

66713518080 is an equidigital number, since it uses as much as digits as its factorization.

66713518080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 66713518080 in words is "sixty-six billion, seven hundred thirteen million, five hundred eighteen thousand, eighty".