66004042444416 has 160 divisors (see below), whose sum is σ = 199117743372900. Its totient is φ = 21699958910976.

The previous prime is 66004042444411. The next prime is 66004042444423. The reversal of 66004042444416 is 61444424040066.

66004042444416 is a `hidden beast` number, since 6 + 600 + 4 + 0 + 4 + 24 + 4 + 4 + 4 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55203354570816 + 10800687873600 = 7429896^2 + 3286440^2 .

It is not an unprimeable number, because it can be changed into a prime (66004042444411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42846771 + ... + 44360498.

Almost surely, 2^{66004042444416} is an apocalyptic number.

It is an amenable number.

66004042444416 is an abundant number, since it is smaller than the sum of its proper divisors (133113700928484).

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

66004042444416 is an equidigital number, since it uses as much as digits as its factorization.

66004042444416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87207368 (or 87207347 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 45.

The spelling of 66004042444416 in words is "sixty-six trillion, four billion, forty-two million, four hundred forty-four thousand, four hundred sixteen".