65666777520009 has 16 divisors (see below), whose sum is σ = 90576267465600. Its totient is φ = 42267616358016.

The previous prime is 65666777519977. The next prime is 65666777520053. The reversal of 65666777520009 is 90002577766656.

It is not a de Polignac number, because 65666777520009 - 2⁵ = 65666777519977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65666777520089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156549 + ... + 11461154.

It is an arithmetic number, because the mean of its divisors is an integer number (5661016716600).

Almost surely, 2^{65666777520009} is an apocalyptic number.

It is an amenable number.

65666777520009 is a deficient number, since it is larger than the sum of its proper divisors (24909489945591).

65666777520009 is a wasteful number, since it uses less digits than its factorization.

65666777520009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11682704.

The product of its (nonzero) digits is 200037600, while the sum is 66.

The spelling of 65666777520009 in words is "sixty-five trillion, six hundred sixty-six billion, seven hundred seventy-seven million, five hundred twenty thousand, nine".