66085661 has 8 divisors (see below), whose sum is σ = 66904704. Its totient is φ = 65270560.

The previous prime is 66085639. The next prime is 66085687. The reversal of 66085661 is 16658066.

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 66085661 - 2⁶ = 66085597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66085361) 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, 45401 + ... + 46833.

It is an arithmetic number, because the mean of its divisors is an integer number (8363088).

Almost surely, 2^66085661 is an apocalyptic number.

It is an amenable number.

66085661 is a deficient number, since it is larger than the sum of its proper divisors (819043).

66085661 is a wasteful number, since it uses less digits than its factorization.

66085661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66085661 is about 8129.3087652026. The cubic root of 66085661 is about 404.2987631746.

The spelling of 66085661 in words is "sixty-six million, eighty-five thousand, six hundred sixty-one".