66740606720 has 36 divisors (see below), whose sum is σ = 159864612600. Its totient is φ = 26696242176.

The previous prime is 66740606711. The next prime is 66740606741. The reversal of 66740606720 is 2760604766.

It is a happy number.

It is a congruent number.

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, 26069270 + ... + 26071829.

Almost surely, 2^66740606720 is an apocalyptic number.

It is an amenable number.

66740606720 is an abundant number, since it is smaller than the sum of its proper divisors (93124005880).

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

66740606720 is an equidigital number, since it uses as much as digits as its factorization.

66740606720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52141120 (or 52141106 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 66740606720 in words is "sixty-six billion, seven hundred forty million, six hundred six thousand, seven hundred twenty".