66651716010666 has 32 divisors (see below), whose sum is σ = 144959534988480. Its totient is φ = 20345197890816.

The previous prime is 66651716010653. The next prime is 66651716010689. The reversal of 66651716010666 is 66601061715666.

It is a happy number.

It is a super-3 number, since 3×66651716010666³ (a number of 42 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, 8830377256 + ... + 8830384803.

It is an arithmetic number, because the mean of its divisors is an integer number (4529985468390).

Almost surely, 2^{66651716010666} is an apocalyptic number.

66651716010666 is an abundant number, since it is smaller than the sum of its proper divisors (78307818977814).

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

66651716010666 is a wasteful number, since it uses less digits than its factorization.

66651716010666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17660762118.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 66651716010666 in words is "sixty-six trillion, six hundred fifty-one billion, seven hundred sixteen million, ten thousand, six hundred sixty-six".