66716601 has 8 divisors (see below), whose sum is σ = 101663424. Its totient is φ = 38123760.

The previous prime is 66716591. The next prime is 66716603. The reversal of 66716601 is 10661766.

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

It is not a de Polignac number, because 66716601 - 2⁵ = 66716569 is a prime.

It is a super-3 number, since 3×66716601³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66716603) 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, 1588470 + ... + 1588511.

It is an arithmetic number, because the mean of its divisors is an integer number (12707928).

Almost surely, 2^66716601 is an apocalyptic number.

It is an amenable number.

66716601 is a deficient number, since it is larger than the sum of its proper divisors (34946823).

66716601 is a wasteful number, since it uses less digits than its factorization.

66716601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176991.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 66716601 is about 8168.0230778322. The cubic root of 66716601 is about 405.5813446734.

The spelling of 66716601 in words is "sixty-six million, seven hundred sixteen thousand, six hundred one".