66156320323229 has 2 divisors, whose sum is σ = 66156320323230. Its totient is φ = 66156320323228.

The previous prime is 66156320323217. The next prime is 66156320323271. The reversal of 66156320323229 is 92232302365166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58072050732004 + 8084269591225 = 7620502^2 + 2843285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66156320323229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66156320323279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078160161614 + 33078160161615.

It is an arithmetic number, because the mean of its divisors is an integer number (33078160161615).

Almost surely, 2^{66156320323229} is an apocalyptic number.

It is an amenable number.

66156320323229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66156320323229 is an equidigital number, since it uses as much as digits as its factorization.

66156320323229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 50.

The spelling of 66156320323229 in words is "sixty-six trillion, one hundred fifty-six billion, three hundred twenty million, three hundred twenty-three thousand, two hundred twenty-nine".