66054210217 has 2 divisors, whose sum is σ = 66054210218. Its totient is φ = 66054210216.

The previous prime is 66054210137. The next prime is 66054210247. The reversal of 66054210217 is 71201245066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60862863616 + 5191346601 = 246704^2 + 72051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66054210217 is a prime.

It is not a weakly prime, because it can be changed into another prime (66054210247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33027105108 + 33027105109.

It is an arithmetic number, because the mean of its divisors is an integer number (33027105109).

Almost surely, 2^66054210217 is an apocalyptic number.

It is an amenable number.

66054210217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66054210217 is an equidigital number, since it uses as much as digits as its factorization.

66054210217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 66054210217 in words is "sixty-six billion, fifty-four million, two hundred ten thousand, two hundred seventeen".