66120306397 has 2 divisors, whose sum is σ = 66120306398. Its totient is φ = 66120306396.

The previous prime is 66120306377. The next prime is 66120306407. The reversal of 66120306397 is 79360302166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65361524281 + 758782116 = 255659^2 + 27546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66120306397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66120306347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33060153198 + 33060153199.

It is an arithmetic number, because the mean of its divisors is an integer number (33060153199).

Almost surely, 2^66120306397 is an apocalyptic number.

It is an amenable number.

66120306397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66120306397 is an equidigital number, since it uses as much as digits as its factorization.

66120306397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 43.

The spelling of 66120306397 in words is "sixty-six billion, one hundred twenty million, three hundred six thousand, three hundred ninety-seven".