165066060821 has 2 divisors, whose sum is σ = 165066060822. Its totient is φ = 165066060820.

The previous prime is 165066060767. The next prime is 165066060823. The reversal of 165066060821 is 128060660561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158651652721 + 6414408100 = 398311^2 + 80090^2 .

It is a cyclic number.

It is not a de Polignac number, because 165066060821 - 2¹⁰ = 165066059797 is a prime.

Together with 165066060823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165066060823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82533030410 + 82533030411.

It is an arithmetic number, because the mean of its divisors is an integer number (82533030411).

Almost surely, 2^165066060821 is an apocalyptic number.

It is an amenable number.

165066060821 is a deficient number, since it is larger than the sum of its proper divisors (1).

165066060821 is an equidigital number, since it uses as much as digits as its factorization.

165066060821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 165066060821 in words is "one hundred sixty-five billion, sixty-six million, sixty thousand, eight hundred twenty-one".