66681117 has 16 divisors (see below), whose sum is σ = 103082880. Its totient is φ = 42520896.

The previous prime is 66681107. The next prime is 66681133. The reversal of 66681117 is 71118666.

It is not a de Polignac number, because 66681117 - 2⁶ = 66681053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681107) 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 15 ways as a sum of consecutive naturals, for example, 53068 + ... + 54309.

It is an arithmetic number, because the mean of its divisors is an integer number (6442680).

Almost surely, 2^66681117 is an apocalyptic number.

It is an amenable number.

66681117 is a deficient number, since it is larger than the sum of its proper divisors (36401763).

66681117 is a wasteful number, since it uses less digits than its factorization.

66681117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107409 (or 107403 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 66681117 is about 8165.8506599129. The cubic root of 66681117 is about 405.5094275372.

The spelling of 66681117 in words is "sixty-six million, six hundred eighty-one thousand, one hundred seventeen".