66617314021 has 2 divisors, whose sum is σ = 66617314022. Its totient is φ = 66617314020.

The previous prime is 66617313979. The next prime is 66617314063. The reversal of 66617314021 is 12041371666.

It is a balanced prime because it is at equal distance from previous prime (66617313979) and next prime (66617314063).

It can be written as a sum of positive squares in only one way, i.e., 55832491521 + 10784822500 = 236289^2 + 103850^2 .

It is a cyclic number.

It is not a de Polignac number, because 66617314021 - 2²¹ = 66615216869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66617354021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33308657010 + 33308657011.

It is an arithmetic number, because the mean of its divisors is an integer number (33308657011).

Almost surely, 2^66617314021 is an apocalyptic number.

It is an amenable number.

66617314021 is a deficient number, since it is larger than the sum of its proper divisors (1).

66617314021 is an equidigital number, since it uses as much as digits as its factorization.

66617314021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

Adding to 66617314021 its reverse (12041371666), we get a palindrome (78658685687).

The spelling of 66617314021 in words is "sixty-six billion, six hundred seventeen million, three hundred fourteen thousand, twenty-one".