66661201 has 8 divisors (see below), whose sum is σ = 67616640. Its totient is φ = 65709552.

The previous prime is 66661193. The next prime is 66661207. The reversal of 66661201 is 10216666.

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 66661201 - 2³ = 66661193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66661201.

It is not an unprimeable number, because it can be changed into a prime (66661207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63640 + ... + 64678.

It is an arithmetic number, because the mean of its divisors is an integer number (8452080).

Almost surely, 2^66661201 is an apocalyptic number.

It is an amenable number.

66661201 is a deficient number, since it is larger than the sum of its proper divisors (955439).

66661201 is a wasteful number, since it uses less digits than its factorization.

66661201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66661201 is about 8164.6311000559. The cubic root of 66661201 is about 405.4690516391.

Adding to 66661201 its reverse (10216666), we get a palindrome (76877867).

The spelling of 66661201 in words is "sixty-six million, six hundred sixty-one thousand, two hundred one".