65666011668 has 12 divisors (see below), whose sum is σ = 153220693920. Its totient is φ = 21888670552.

The previous prime is 65666011651. The next prime is 65666011727. The reversal of 65666011668 is 86611066656.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 65666011668.

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, 2736083808 + ... + 2736083831.

It is an arithmetic number, because the mean of its divisors is an integer number (12768391160).

Almost surely, 2^65666011668 is an apocalyptic number.

It is an amenable number.

65666011668 is an abundant number, since it is smaller than the sum of its proper divisors (87554682252).

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

65666011668 is a wasteful number, since it uses less digits than its factorization.

65666011668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472167646 (or 5472167644 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 65666011668 in words is "sixty-five billion, six hundred sixty-six million, eleven thousand, six hundred sixty-eight".