66945001 has 2 divisors, whose sum is σ = 66945002. Its totient is φ = 66945000.

The previous prime is 66944987. The next prime is 66945007. The reversal of 66945001 is 10054966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 5400976 = 7845^2 + 2324^2 .

It is a cyclic number.

It is not a de Polignac number, because 66945001 - 2¹³ = 66936809 is a prime.

It is not a weakly prime, because it can be changed into another prime (66945007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33472500 + 33472501.

It is an arithmetic number, because the mean of its divisors is an integer number (33472501).

Almost surely, 2^66945001 is an apocalyptic number.

It is an amenable number.

66945001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66945001 is an equidigital number, since it uses as much as digits as its factorization.

66945001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66945001 is about 8181.9924834969. The cubic root of 66945001 is about 406.0436447536.

Adding to 66945001 its reverse (10054966), we get a palindrome (76999967).

The spelling of 66945001 in words is "sixty-six million, nine hundred forty-five thousand, one".