66660353840520 has 192 divisors, whose sum is σ = 236345819673600. Its totient is φ = 16159773634560.

The previous prime is 66660353840519. The next prime is 66660353840557. The reversal of 66660353840520 is 2504835306666.

It is a super-3 number, since 3×66660353840520³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 255721369 + ... + 255981911.

It is an arithmetic number, because the mean of its divisors is an integer number (1230967810800).

Almost surely, 2^{66660353840520} is an apocalyptic number.

66660353840520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66660353840520 is an abundant number, since it is smaller than the sum of its proper divisors (169685465833080).

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

66660353840520 is a wasteful number, since it uses less digits than its factorization.

66660353840520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325180 (or 325173 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 54.

The spelling of 66660353840520 in words is "sixty-six trillion, six hundred sixty billion, three hundred fifty-three million, eight hundred forty thousand, five hundred twenty".