65666011665615 has 16 divisors (see below), whose sum is σ = 105102652789728. Its totient is φ = 35009528180096.

The previous prime is 65666011665601. The next prime is 65666011665619. The reversal of 65666011665615 is 51656611066656.

It is a cyclic number.

It is not a de Polignac number, because 65666011665615 - 2¹² = 65666011661519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666011665619) 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, 771500292 + ... + 771585401.

It is an arithmetic number, because the mean of its divisors is an integer number (6568915799358).

Almost surely, 2^{65666011665615} is an apocalyptic number.

65666011665615 is a deficient number, since it is larger than the sum of its proper divisors (39436641124113).

65666011665615 is a wasteful number, since it uses less digits than its factorization.

65666011665615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543088538.

The product of its (nonzero) digits is 34992000, while the sum is 60.

The spelling of 65666011665615 in words is "sixty-five trillion, six hundred sixty-six billion, eleven million, six hundred sixty-five thousand, six hundred fifteen".