66697201 has 8 divisors (see below), whose sum is σ = 71920800. Its totient is φ = 61644960.

The previous prime is 66697193. The next prime is 66697229. The reversal of 66697201 is 10279666.

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 66697201 - 2³ = 66697193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66697231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42031 + ... + 43588.

It is an arithmetic number, because the mean of its divisors is an integer number (8990100).

Almost surely, 2^66697201 is an apocalyptic number.

It is an amenable number.

66697201 is a deficient number, since it is larger than the sum of its proper divisors (5223599).

66697201 is a wasteful number, since it uses less digits than its factorization.

66697201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85679.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 66697201 is about 8166.8354336303. The cubic root of 66697201 is about 405.5420289172.

The spelling of 66697201 in words is "sixty-six million, six hundred ninety-seven thousand, two hundred one".