666424266444 has 18 divisors (see below), whose sum is σ = 1684572451380. Its totient is φ = 222141422136.

The previous prime is 666424266419. The next prime is 666424266499. The reversal of 666424266444 is 444662424666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9255892554 + ... + 9255892625.

It is an arithmetic number, because the mean of its divisors is an integer number (93587358410).

Almost surely, 2^666424266444 is an apocalyptic number.

It is an amenable number.

666424266444 is an abundant number, since it is smaller than the sum of its proper divisors (1018148184936).

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

666424266444 is a wasteful number, since it uses less digits than its factorization.

666424266444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18511785189 (or 18511785184 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 54.

The spelling of 666424266444 in words is "six hundred sixty-six billion, four hundred twenty-four million, two hundred sixty-six thousand, four hundred forty-four".