666125000 has 84 divisors (see below), whose sum is σ = 1582889895. Its totient is φ = 262800000.

The previous prime is 666124967. The next prime is 666125017. The reversal of 666125000 is 521666.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 11 ways, for example, as 551592196 + 114532804 = 23486^2 + 10702^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18250.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 9124964 + ... + 9125036.

Almost surely, 2^666125000 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 666125000

666125000 is an abundant number, since it is smaller than the sum of its proper divisors (916764895).

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

666125000 is an frugal number, since it uses more digits than its factorization.

666125000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 666125000 is about 25809.3975133090. The cubic root of 666125000 is about 873.3438059204.

Adding to 666125000 its reverse (521666), we get a palindrome (666646666).

The spelling of 666125000 in words is "six hundred sixty-six million, one hundred twenty-five thousand".