66570325321 has 2 divisors, whose sum is σ = 66570325322. Its totient is φ = 66570325320.

The previous prime is 66570325303. The next prime is 66570325351. The reversal of 66570325321 is 12352307566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46416548025 + 20153777296 = 215445^2 + 141964^2 .

It is a cyclic number.

It is not a de Polignac number, because 66570325321 - 2¹³ = 66570317129 is a prime.

It is not a weakly prime, because it can be changed into another prime (66570325351) 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, 33285162660 + 33285162661.

It is an arithmetic number, because the mean of its divisors is an integer number (33285162661).

Almost surely, 2^66570325321 is an apocalyptic number.

It is an amenable number.

66570325321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66570325321 is an equidigital number, since it uses as much as digits as its factorization.

66570325321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 66570325321 in words is "sixty-six billion, five hundred seventy million, three hundred twenty-five thousand, three hundred twenty-one".