66225128 has 8 divisors (see below), whose sum is σ = 124172130. Its totient is φ = 33112560.

The previous prime is 66225109. The next prime is 66225139. The reversal of 66225128 is 82152266.

It can be written as a sum of positive squares in only one way, i.e., 62758084 + 3467044 = 7922^2 + 1862^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 66225094 and 66225103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4139063 + ... + 4139078.

Almost surely, 2^66225128 is an apocalyptic number.

It is an amenable number.

66225128 is a deficient number, since it is larger than the sum of its proper divisors (57947002).

66225128 is a wasteful number, since it uses less digits than its factorization.

66225128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8278147 (or 8278143 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 66225128 is about 8137.8822798072. The cubic root of 66225128 is about 404.5829736742.

The spelling of 66225128 in words is "sixty-six million, two hundred twenty-five thousand, one hundred twenty-eight".