66931672 has 8 divisors (see below), whose sum is σ = 125496900. Its totient is φ = 33465832.

The previous prime is 66931643. The next prime is 66931673. The reversal of 66931672 is 27613966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66931673) 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 as a sum of consecutive naturals, namely, 4183222 + ... + 4183237.

Almost surely, 2^66931672 is an apocalyptic number.

It is an amenable number.

66931672 is a deficient number, since it is larger than the sum of its proper divisors (58565228).

66931672 is a wasteful number, since it uses less digits than its factorization.

66931672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8366465 (or 8366461 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 66931672 is about 8181.1779103012. The cubic root of 66931672 is about 406.0166946956.

The spelling of 66931672 in words is "sixty-six million, nine hundred thirty-one thousand, six hundred seventy-two".