66165081 has 8 divisors (see below), whose sum is σ = 88275264. Its totient is φ = 44082480.

The previous prime is 66165079. The next prime is 66165097. The reversal of 66165081 is 18056166.

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

It is not a de Polignac number, because 66165081 - 2¹ = 66165079 is a prime.

It is a super-2 number, since 2×66165081² = 8755635887473122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66165031) 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, 430 + ... + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (11034408).

Almost surely, 2^66165081 is an apocalyptic number.

It is an amenable number.

66165081 is a deficient number, since it is larger than the sum of its proper divisors (22110183).

66165081 is a wasteful number, since it uses less digits than its factorization.

66165081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13791.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 66165081 is about 8134.1920926420. The cubic root of 66165081 is about 404.4606568598.

The spelling of 66165081 in words is "sixty-six million, one hundred sixty-five thousand, eighty-one".