66083776640065 has 16 divisors (see below), whose sum is σ = 79518245107536. Its totient is φ = 52722046540800.

The previous prime is 66083776640053. The next prime is 66083776640113. The reversal of 66083776640065 is 56004667738066.

It is a happy number.

66083776640065 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 28141231938561 + 37942544701504 = 5304831^2 + 6159752^2 .

It is not a de Polignac number, because 66083776640065 - 2³⁵ = 66049416901697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66083776639979 and 66083776640006.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7296876 + ... + 13616605.

It is an arithmetic number, because the mean of its divisors is an integer number (4969890319221).

Almost surely, 2^{66083776640065} is an apocalyptic number.

It is an amenable number.

66083776640065 is a deficient number, since it is larger than the sum of its proper divisors (13434468467471).

66083776640065 is a wasteful number, since it uses less digits than its factorization.

66083776640065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20915220.

The product of its (nonzero) digits is 182891520, while the sum is 64.

The spelling of 66083776640065 in words is "sixty-six trillion, eighty-three billion, seven hundred seventy-six million, six hundred forty thousand, sixty-five".