66065444 has 12 divisors (see below), whose sum is σ = 116214924. Its totient is φ = 32861184.

The previous prime is 66065437. The next prime is 66065471. The reversal of 66065444 is 44456066.

It can be written as a sum of positive squares in 2 ways, for example, as 18593344 + 47472100 = 4312^2 + 6890^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42017 + ... + 43560.

It is an arithmetic number, because the mean of its divisors is an integer number (9684577).

Almost surely, 2^66065444 is an apocalyptic number.

It is an amenable number.

66065444 is a deficient number, since it is larger than the sum of its proper divisors (50149480).

66065444 is a wasteful number, since it uses less digits than its factorization.

66065444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85774 (or 85772 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 66065444 is about 8128.0652064314. The cubic root of 66065444 is about 404.2575311250.

The spelling of 66065444 in words is "sixty-six million, sixty-five thousand, four hundred forty-four".