66681038 has 16 divisors (see below), whose sum is σ = 107185680. Its totient is φ = 30999936.

The previous prime is 66681037. The next prime is 66681053. The reversal of 66681038 is 83018666.

It is a junction number, because it is equal to n+sod(n) for n = 66680992 and 66681010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681037) 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 7 ways as a sum of consecutive naturals, for example, 8993 + ... + 14636.

It is an arithmetic number, because the mean of its divisors is an integer number (6699105).

Almost surely, 2^66681038 is an apocalyptic number.

66681038 is a deficient number, since it is larger than the sum of its proper divisors (40504642).

66681038 is a wasteful number, since it uses less digits than its factorization.

66681038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23731.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 66681038 is about 8165.8458226934. The cubic root of 66681038 is about 405.5092673956.

The spelling of 66681038 in words is "sixty-six million, six hundred eighty-one thousand, thirty-eight".