66161260223 has 2 divisors, whose sum is σ = 66161260224. Its totient is φ = 66161260222.

The previous prime is 66161260163. The next prime is 66161260247. The reversal of 66161260223 is 32206216166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66161260223 - 2¹⁴ = 66161243839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66161260423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33080630111 + 33080630112.

It is an arithmetic number, because the mean of its divisors is an integer number (33080630112).

Almost surely, 2^66161260223 is an apocalyptic number.

66161260223 is a deficient number, since it is larger than the sum of its proper divisors (1).

66161260223 is an equidigital number, since it uses as much as digits as its factorization.

66161260223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 66161260223 its reverse (32206216166), we get a palindrome (98367476389).

The spelling of 66161260223 in words is "sixty-six billion, one hundred sixty-one million, two hundred sixty thousand, two hundred twenty-three".