66165677 has 8 divisors (see below), whose sum is σ = 69060600. Its totient is φ = 63331840.

The previous prime is 66165653. The next prime is 66165679. The reversal of 66165677 is 77656166.

It can be written as a sum of positive squares in 4 ways, for example, as 3721 + 66161956 = 61^2 + 8134^2 .

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 66165677 - 2¹⁰ = 66164653 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 (66165679) 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, 13052 + ... + 17397.

It is an arithmetic number, because the mean of its divisors is an integer number (8632575).

Almost surely, 2^66165677 is an apocalyptic number.

It is an amenable number.

66165677 is a deficient number, since it is larger than the sum of its proper divisors (2894923).

66165677 is a wasteful number, since it uses less digits than its factorization.

66165677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30543.

The product of its digits is 317520, while the sum is 44.

The square root of 66165677 is about 8134.2287280356. The cubic root of 66165677 is about 404.4618712860.

The spelling of 66165677 in words is "sixty-six million, one hundred sixty-five thousand, six hundred seventy-seven".