66165506041 has 2 divisors, whose sum is σ = 66165506042. Its totient is φ = 66165506040.

The previous prime is 66165505999. The next prime is 66165506093. The reversal of 66165506041 is 14060556166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53536241641 + 12629264400 = 231379^2 + 112380^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165506041 - 2¹⁵ = 66165473273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66165505985 and 66165506003.

It is not a weakly prime, because it can be changed into another prime (66165501041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082753020 + 33082753021.

It is an arithmetic number, because the mean of its divisors is an integer number (33082753021).

Almost surely, 2^66165506041 is an apocalyptic number.

It is an amenable number.

66165506041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165506041 is an equidigital number, since it uses as much as digits as its factorization.

66165506041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 66165506041 in words is "sixty-six billion, one hundred sixty-five million, five hundred six thousand, forty-one".