66225656720 has 80 divisors (see below), whose sum is σ = 166031873280. Its totient is φ = 24483916800.

The previous prime is 66225656719. The next prime is 66225656741. The reversal of 66225656720 is 2765652266.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×66225656720³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469016 + ... + 593655.

It is an arithmetic number, because the mean of its divisors is an integer number (2075398416).

Almost surely, 2^66225656720 is an apocalyptic number.

It is an amenable number.

66225656720 is an abundant number, since it is smaller than the sum of its proper divisors (99806216560).

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

66225656720 is a wasteful number, since it uses less digits than its factorization.

66225656720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062744 (or 1062738 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 66225656720 in words is "sixty-six billion, two hundred twenty-five million, six hundred fifty-six thousand, seven hundred twenty".