66444336440424 has 48 divisors (see below), whose sum is σ = 179973030708900. Its totient is φ = 22145697437184.

The previous prime is 66444336440401. The next prime is 66444336440473. The reversal of 66444336440424 is 42404463344466.

66444336440424 is a `hidden beast` number, since 6 + 64 + 443 + 3 + 64 + 40 + 42 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66443398243524 + 938196900 = 8151282^2 + 30630^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49641409 + ... + 50962320.

Almost surely, 2^{66444336440424} is an apocalyptic number.

It is an amenable number.

66444336440424 is an abundant number, since it is smaller than the sum of its proper divisors (113528694268476).

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

66444336440424 is a wasteful number, since it uses less digits than its factorization.

66444336440424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100612914 (or 100612907 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 54.

The spelling of 66444336440424 in words is "sixty-six trillion, four hundred forty-four billion, three hundred thirty-six million, four hundred forty thousand, four hundred twenty-four".