66165641 has 8 divisors (see below), whose sum is σ = 69210240. Its totient is φ = 63135072.

The previous prime is 66165637. The next prime is 66165643. The reversal of 66165641 is 14656166.

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 66165641 - 2² = 66165637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66165643) 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, 6821 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (8651280).

Almost surely, 2^66165641 is an apocalyptic number.

It is an amenable number.

66165641 is a deficient number, since it is larger than the sum of its proper divisors (3044599).

66165641 is a wasteful number, since it uses less digits than its factorization.

66165641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015.

The product of its digits is 25920, while the sum is 35.

The square root of 66165641 is about 8134.2265151642. The cubic root of 66165641 is about 404.4617979316.

The spelling of 66165641 in words is "sixty-six million, one hundred sixty-five thousand, six hundred forty-one".