66450603123601 has 2 divisors, whose sum is σ = 66450603123602. Its totient is φ = 66450603123600.

The previous prime is 66450603123529. The next prime is 66450603123613. The reversal of 66450603123601 is 10632130605466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64857009958225 + 1593593165376 = 8053385^2 + 1262376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66450603123601 is a prime.

It is not a weakly prime, because it can be changed into another prime (66450603123631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225301561800 + 33225301561801.

It is an arithmetic number, because the mean of its divisors is an integer number (33225301561801).

Almost surely, 2^{66450603123601} is an apocalyptic number.

It is an amenable number.

66450603123601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450603123601 is an equidigital number, since it uses as much as digits as its factorization.

66450603123601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 66450603123601 in words is "sixty-six trillion, four hundred fifty billion, six hundred three million, one hundred twenty-three thousand, six hundred one".