66641237009 has 2 divisors, whose sum is σ = 66641237010. Its totient is φ = 66641237008.

The previous prime is 66641236939. The next prime is 66641237071. The reversal of 66641237009 is 90073214666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59119491025 + 7521745984 = 243145^2 + 86728^2 .

It is a cyclic number.

It is not a de Polignac number, because 66641237009 - 2²⁸ = 66372801553 is a prime.

It is a super-3 number, since 3×66641237009³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (66641239009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33320618504 + 33320618505.

It is an arithmetic number, because the mean of its divisors is an integer number (33320618505).

Almost surely, 2^66641237009 is an apocalyptic number.

It is an amenable number.

66641237009 is a deficient number, since it is larger than the sum of its proper divisors (1).

66641237009 is an equidigital number, since it uses as much as digits as its factorization.

66641237009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 66641237009 in words is "sixty-six billion, six hundred forty-one million, two hundred thirty-seven thousand, nine".