66225138 has 32 divisors (see below), whose sum is σ = 153859200. Its totient is φ = 18610560.

The previous prime is 66225109. The next prime is 66225139. The reversal of 66225138 is 83152266.

It is a junction number, because it is equal to n+sod(n) for n = 66225099 and 66225108.

It is not an unprimeable number, because it can be changed into a prime (66225139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10363 + ... + 15486.

It is an arithmetic number, because the mean of its divisors is an integer number (4808100).

Almost surely, 2^66225138 is an apocalyptic number.

66225138 is an abundant number, since it is smaller than the sum of its proper divisors (87634062).

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

66225138 is a wasteful number, since it uses less digits than its factorization.

66225138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25922.

The product of its digits is 17280, while the sum is 33.

The square root of 66225138 is about 8137.8828942176. The cubic root of 66225138 is about 404.5829940382.

The spelling of 66225138 in words is "sixty-six million, two hundred twenty-five thousand, one hundred thirty-eight".