66780201 has 16 divisors (see below), whose sum is σ = 94095360. Its totient is φ = 42042000.

The previous prime is 66780151. The next prime is 66780209. The reversal of 66780201 is 10208766.

It is a happy number.

It is not a de Polignac number, because 66780201 - 2⁶ = 66780137 is a prime.

It is a super-3 number, since 3×66780201³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66780209) 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 in 15 ways as a sum of consecutive naturals, for example, 675 + ... + 11576.

It is an arithmetic number, because the mean of its divisors is an integer number (5880960).

Almost surely, 2^66780201 is an apocalyptic number.

It is an amenable number.

66780201 is a deficient number, since it is larger than the sum of its proper divisors (27315159).

66780201 is a wasteful number, since it uses less digits than its factorization.

66780201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12356.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 66780201 is about 8171.9153813534. The cubic root of 66780201 is about 405.7101820782.

Adding to 66780201 its reverse (10208766), we get a palindrome (76988967).

The spelling of 66780201 in words is "sixty-six million, seven hundred eighty thousand, two hundred one".