66000521610018 has 32 divisors (see below), whose sum is σ = 147213059385600. Its totient is φ = 21918388832208.

The previous prime is 66000521610017. The next prime is 66000521610073. The reversal of 66000521610018 is 81001612500066.

66000521610018 is a `hidden beast` number, since 6 + 6 + 0 + 0 + 0 + 5 + 21 + 610 + 0 + 18 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66000521610011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271791946 + ... + 2271820997.

It is an arithmetic number, because the mean of its divisors is an integer number (4600408105800).

Almost surely, 2^{66000521610018} is an apocalyptic number.

66000521610018 is an abundant number, since it is smaller than the sum of its proper divisors (81212537775582).

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

66000521610018 is a wasteful number, since it uses less digits than its factorization.

66000521610018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543613223 (or 4543613217 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 66000521610018 in words is "sixty-six trillion, five hundred twenty-one million, six hundred ten thousand, eighteen".