666744344 has 32 divisors (see below), whose sum is σ = 1431004320. Its totient is φ = 285294336.

The previous prime is 666744343. The next prime is 666744347. The reversal of 666744344 is 443447666.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666744295 and 666744304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666744343) by changing a digit.

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, 27452 + ... + 45684.

It is an arithmetic number, because the mean of its divisors is an integer number (44718885).

Almost surely, 2^666744344 is an apocalyptic number.

It is an amenable number.

666744344 is an abundant number, since it is smaller than the sum of its proper divisors (764259976).

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

666744344 is a wasteful number, since it uses less digits than its factorization.

666744344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18899 (or 18895 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 44.

The square root of 666744344 is about 25821.3931459943. The cubic root of 666744344 is about 873.6143921191.

The spelling of 666744344 in words is "six hundred sixty-six million, seven hundred forty-four thousand, three hundred forty-four".