66450101 has 2 divisors, whose sum is σ = 66450102. Its totient is φ = 66450100.

The previous prime is 66450077. The next prime is 66450149. The reversal of 66450101 is 10105466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 1002001 = 8090^2 + 1001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66450101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66450191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225050 + 33225051.

It is an arithmetic number, because the mean of its divisors is an integer number (33225051).

Almost surely, 2^66450101 is an apocalyptic number.

It is an amenable number.

66450101 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450101 is an equidigital number, since it uses as much as digits as its factorization.

66450101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66450101 is about 8151.6931370115. The cubic root of 66450101 is about 405.0405913693.

Adding to 66450101 its reverse (10105466), we get a palindrome (76555567).

The spelling of 66450101 in words is "sixty-six million, four hundred fifty thousand, one hundred one".