66668865424 has 40 divisors (see below), whose sum is σ = 147680012160. Its totient is φ = 28561513728.

The previous prime is 66668865377. The next prime is 66668865437. The reversal of 66668865424 is 42456886666.

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 7 ways as a sum of consecutive naturals, for example, 186492 + ... + 410020.

It is an arithmetic number, because the mean of its divisors is an integer number (3692000304).

Almost surely, 2^66668865424 is an apocalyptic number.

It is an amenable number.

66668865424 is an abundant number, since it is smaller than the sum of its proper divisors (81011146736).

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

66668865424 is a wasteful number, since it uses less digits than its factorization.

66668865424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226207 (or 226201 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 61.

The spelling of 66668865424 in words is "sixty-six billion, six hundred sixty-eight million, eight hundred sixty-five thousand, four hundred twenty-four".