66004901 has 2 divisors, whose sum is σ = 66004902. Its totient is φ = 66004900.

The previous prime is 66004891. The next prime is 66004949. The reversal of 66004901 is 10940066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55860676 + 10144225 = 7474^2 + 3185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66004901 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 (66004951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33002450 + 33002451.

It is an arithmetic number, because the mean of its divisors is an integer number (33002451).

Almost surely, 2^66004901 is an apocalyptic number.

It is an amenable number.

66004901 is a deficient number, since it is larger than the sum of its proper divisors (1).

66004901 is an equidigital number, since it uses as much as digits as its factorization.

66004901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 66004901 is about 8124.3400347351. The cubic root of 66004901 is about 404.1340049042.

Adding to 66004901 its reverse (10940066), we get a palindrome (76944967).

The spelling of 66004901 in words is "sixty-six million, four thousand, nine hundred one".