66852181 has 16 divisors (see below), whose sum is σ = 75152448. Its totient is φ = 58940800.

The previous prime is 66852173. The next prime is 66852187. The reversal of 66852181 is 18125866.

It is a cyclic number.

It is not a de Polignac number, because 66852181 - 2³ = 66852173 is a prime.

It is a super-4 number, since 4×66852181⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 66852181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66852187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102051 + ... + 102703.

It is an arithmetic number, because the mean of its divisors is an integer number (4697028).

Almost surely, 2^66852181 is an apocalyptic number.

It is an amenable number.

66852181 is a deficient number, since it is larger than the sum of its proper divisors (8300267).

66852181 is a wasteful number, since it uses less digits than its factorization.

66852181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932.

The product of its digits is 23040, while the sum is 37.

The square root of 66852181 is about 8176.3183034909. The cubic root of 66852181 is about 405.8558965886.

The spelling of 66852181 in words is "sixty-six million, eight hundred fifty-two thousand, one hundred eighty-one".