66016240 has 20 divisors (see below), whose sum is σ = 153487944. Its totient is φ = 26406464.

The previous prime is 66016207. The next prime is 66016261. The reversal of 66016240 is 4261066.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 412522 + ... + 412681.

Almost surely, 2^66016240 is an apocalyptic number.

It is an amenable number.

66016240 is an abundant number, since it is smaller than the sum of its proper divisors (87471704).

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

66016240 is a wasteful number, since it uses less digits than its factorization.

66016240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825216 (or 825210 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66016240 is about 8125.0378460657. The cubic root of 66016240 is about 404.1571456762.

It can be divided in two parts, 660 and 16240, that added together give a square (16900 = 130²).

The spelling of 66016240 in words is "sixty-six million, sixteen thousand, two hundred forty".