66422172 has 12 divisors (see below), whose sum is σ = 154985096. Its totient is φ = 22140720.

The previous prime is 66422171. The next prime is 66422201. The reversal of 66422172 is 27122466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66422171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2767579 + ... + 2767602.

Almost surely, 2^66422172 is an apocalyptic number.

It is an amenable number.

66422172 is an abundant number, since it is smaller than the sum of its proper divisors (88562924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66422172 is a wasteful number, since it uses less digits than its factorization.

66422172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535188 (or 5535186 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 66422172 is about 8149.9798772758. The cubic root of 66422172 is about 404.9838371846.

The spelling of 66422172 in words is "sixty-six million, four hundred twenty-two thousand, one hundred seventy-two".