66652100161 has 2 divisors, whose sum is σ = 66652100162. Its totient is φ = 66652100160.

The previous prime is 66652100159. The next prime is 66652100173. The reversal of 66652100161 is 16100125666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57099969936 + 9552130225 = 238956^2 + 97735^2 .

It is a cyclic number.

It is not a de Polignac number, because 66652100161 - 2¹ = 66652100159 is a prime.

Together with 66652100159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66652100761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33326050080 + 33326050081.

It is an arithmetic number, because the mean of its divisors is an integer number (33326050081).

Almost surely, 2^66652100161 is an apocalyptic number.

It is an amenable number.

66652100161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66652100161 is an equidigital number, since it uses as much as digits as its factorization.

66652100161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 66652100161 in words is "sixty-six billion, six hundred fifty-two million, one hundred thousand, one hundred sixty-one".