66622001 has 2 divisors, whose sum is σ = 66622002. Its totient is φ = 66622000.

The previous prime is 66621991. The next prime is 66622013. The reversal of 66622001 is 10022666.

66622001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35093776 + 31528225 = 5924^2 + 5615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66622001 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66622021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33311000 + 33311001.

It is an arithmetic number, because the mean of its divisors is an integer number (33311001).

Almost surely, 2^66622001 is an apocalyptic number.

It is an amenable number.

66622001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66622001 is an equidigital number, since it uses as much as digits as its factorization.

66622001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 66622001 is about 8162.2301486787. The cubic root of 66622001 is about 405.3895576048.

Adding to 66622001 its reverse (10022666), we get a palindrome (76644667).

The spelling of 66622001 in words is "sixty-six million, six hundred twenty-two thousand, one".