66682161 has 36 divisors (see below), whose sum is σ = 119216448. Its totient is φ = 35167392.

The previous prime is 66682157. The next prime is 66682163. The reversal of 66682161 is 16128666.

It is not a de Polignac number, because 66682161 - 2² = 66682157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66682163) 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 35 ways as a sum of consecutive naturals, for example, 7516 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (3311568).

Almost surely, 2^66682161 is an apocalyptic number.

It is an amenable number.

66682161 is a deficient number, since it is larger than the sum of its proper divisors (52534287).

66682161 is a wasteful number, since it uses less digits than its factorization.

66682161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302 (or 6286 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 66682161 is about 8165.9145844174. The cubic root of 66682161 is about 405.5115438266.

The spelling of 66682161 in words is "sixty-six million, six hundred eighty-two thousand, one hundred sixty-one".