666623000 has 128 divisors (see below), whose sum is σ = 1635379200. Its totient is φ = 254016000.

The previous prime is 666622991. The next prime is 666623003. The reversal of 666623000 is 326666.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666623003) 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 31 ways as a sum of consecutive naturals, for example, 3682910 + ... + 3683090.

It is an arithmetic number, because the mean of its divisors is an integer number (12776400).

Almost surely, 2^666623000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666623000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817689600).

666623000 is an abundant number, since it is smaller than the sum of its proper divisors (968756200).

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

666623000 is a wasteful number, since it uses less digits than its factorization.

666623000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 666623000 is about 25819.0433595050. The cubic root of 666623000 is about 873.5613911464.

Adding to 666623000 its reverse (326666), we get a palindrome (666949666).

The spelling of 666623000 in words is "six hundred sixty-six million, six hundred twenty-three thousand".