66681201 has 8 divisors (see below), whose sum is σ = 89087040. Its totient is φ = 44364752.

The previous prime is 66681169. The next prime is 66681229. The reversal of 66681201 is 10218666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66681201 - 2⁵ = 66681169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66681271) 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 7 ways as a sum of consecutive naturals, for example, 20586 + ... + 23603.

It is an arithmetic number, because the mean of its divisors is an integer number (11135880).

Almost surely, 2^66681201 is an apocalyptic number.

It is an amenable number.

66681201 is a deficient number, since it is larger than the sum of its proper divisors (22405839).

66681201 is a wasteful number, since it uses less digits than its factorization.

66681201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44695.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 66681201 is about 8165.8558032823. The cubic root of 66681201 is about 405.5095978141.

Adding to 66681201 its reverse (10218666), we get a palindrome (76899867).

The spelling of 66681201 in words is "sixty-six million, six hundred eighty-one thousand, two hundred one".