65666606501081 has 8 divisors (see below), whose sum is σ = 66104494220544. Its totient is φ = 65230156837440.

The previous prime is 65666606501051. The next prime is 65666606501117. The reversal of 65666606501081 is 18010560666656.

65666606501081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65666606501081 - 2⁶ = 65666606501017 is a prime.

It is a super-2 number, since 2×65666606501081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65666606501051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359422325 + ... + 359604978.

It is an arithmetic number, because the mean of its divisors is an integer number (8263061777568).

Almost surely, 2^{65666606501081} is an apocalyptic number.

It is an amenable number.

65666606501081 is a deficient number, since it is larger than the sum of its proper divisors (437887719463).

65666606501081 is a wasteful number, since it uses less digits than its factorization.

65666606501081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719027911.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 65666606501081 in words is "sixty-five trillion, six hundred sixty-six billion, six hundred six million, five hundred one thousand, eighty-one".