66060605665 has 16 divisors (see below), whose sum is σ = 81318669696. Its totient is φ = 51490656000.

The previous prime is 66060605627. The next prime is 66060605671. The reversal of 66060605665 is 56650606066.

It is not a de Polignac number, because 66060605665 - 2²³ = 66052217057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296901 + ... + 469330.

It is an arithmetic number, because the mean of its divisors is an integer number (5082416856).

Almost surely, 2^66060605665 is an apocalyptic number.

It is an amenable number.

66060605665 is a deficient number, since it is larger than the sum of its proper divisors (15258064031).

66060605665 is a wasteful number, since it uses less digits than its factorization.

66060605665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766680.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 66060605665 in words is "sixty-six billion, sixty million, six hundred five thousand, six hundred sixty-five".