66931642 has 16 divisors (see below), whose sum is σ = 105876000. Its totient is φ = 31646160.

The previous prime is 66931637. The next prime is 66931643. The reversal of 66931642 is 24613966.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66931643) 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, 24984 + ... + 27532.

It is an arithmetic number, because the mean of its divisors is an integer number (6617250).

Almost surely, 2^66931642 is an apocalyptic number.

66931642 is a deficient number, since it is larger than the sum of its proper divisors (38944358).

66931642 is a wasteful number, since it uses less digits than its factorization.

66931642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261.

The product of its digits is 46656, while the sum is 37.

The square root of 66931642 is about 8181.1760768242. The cubic root of 66931642 is about 406.0166340342.

The spelling of 66931642 in words is "sixty-six million, nine hundred thirty-one thousand, six hundred forty-two".