66044566324440 has 192 divisors, whose sum is σ = 239603543562240. Its totient is φ = 15638459639040.

The previous prime is 66044566324421. The next prime is 66044566324489. The reversal of 66044566324440 is 4442366544066.

It is a happy number.

66044566324440 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 4 + 566 + 32 + 4 + 4 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 193759032 + ... + 194099591.

It is an arithmetic number, because the mean of its divisors is an integer number (1247935122720).

Almost surely, 2^{66044566324440} is an apocalyptic number.

66044566324440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66044566324440 is an abundant number, since it is smaller than the sum of its proper divisors (173558977237800).

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

66044566324440 is a wasteful number, since it uses less digits than its factorization.

66044566324440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387858694 (or 387858687 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 54.

The spelling of 66044566324440 in words is "sixty-six trillion, forty-four billion, five hundred sixty-six million, three hundred twenty-four thousand, four hundred forty".