66440056 has 16 divisors (see below), whose sum is σ = 125528040. Its totient is φ = 32965920.

The previous prime is 66440021. The next prime is 66440071. The reversal of 66440056 is 65004466.

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, 30651 + ... + 32746.

Almost surely, 2^66440056 is an apocalyptic number.

It is an amenable number.

66440056 is a deficient number, since it is larger than the sum of its proper divisors (59087984).

66440056 is a wasteful number, since it uses less digits than its factorization.

66440056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63534 (or 63530 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66440056 is about 8151.0769840555. The cubic root of 66440056 is about 405.0201808772.

The spelling of 66440056 in words is "sixty-six million, four hundred forty thousand, fifty-six".