66889201 has 2 divisors, whose sum is σ = 66889202. Its totient is φ = 66889200.

The previous prime is 66889189. The next prime is 66889211. The reversal of 66889201 is 10298866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 303601 = 8160^2 + 551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66889201 is a prime.

It is not a weakly prime, because it can be changed into another prime (66889211) 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, 33444600 + 33444601.

It is an arithmetic number, because the mean of its divisors is an integer number (33444601).

Almost surely, 2^66889201 is an apocalyptic number.

It is an amenable number.

66889201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66889201 is an equidigital number, since it uses as much as digits as its factorization.

66889201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 66889201 is about 8178.5818452834. The cubic root of 66889201 is about 405.9307982226.

The spelling of 66889201 in words is "sixty-six million, eight hundred eighty-nine thousand, two hundred one".