66617150321 has 2 divisors, whose sum is σ = 66617150322. Its totient is φ = 66617150320.

The previous prime is 66617150287. The next prime is 66617150359. The reversal of 66617150321 is 12305171666.

It is an a-pointer prime, because the next prime (66617150359) can be obtained adding 66617150321 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66213582400 + 403567921 = 257320^2 + 20089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66617150321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66617150921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33308575160 + 33308575161.

It is an arithmetic number, because the mean of its divisors is an integer number (33308575161).

Almost surely, 2^66617150321 is an apocalyptic number.

It is an amenable number.

66617150321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66617150321 is an equidigital number, since it uses as much as digits as its factorization.

66617150321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 66617150321 in words is "sixty-six billion, six hundred seventeen million, one hundred fifty thousand, three hundred twenty-one".