66501746020 has 12 divisors (see below), whose sum is σ = 139653666684. Its totient is φ = 26600698400.

The previous prime is 66501746009. The next prime is 66501746033. The reversal of 66501746020 is 2064710566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40632883776 + 25868862244 = 201576^2 + 160838^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662543631 + ... + 1662543670.

It is an arithmetic number, because the mean of its divisors is an integer number (11637805557).

Almost surely, 2^66501746020 is an apocalyptic number.

It is an amenable number.

66501746020 is an abundant number, since it is smaller than the sum of its proper divisors (73151920664).

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

66501746020 is a wasteful number, since it uses less digits than its factorization.

66501746020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325087310 (or 3325087308 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 66501746020 in words is "sixty-six billion, five hundred one million, seven hundred forty-six thousand, twenty".