666225000 has 480 divisors, whose sum is σ = 2722325760. Its totient is φ = 149040000.

The previous prime is 666224971. The next prime is 666225011. The reversal of 666225000 is 522666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 14174977 + ... + 14175023.

It is an arithmetic number, because the mean of its divisors is an integer number (5671512).

Almost surely, 2^666225000 is an apocalyptic number.

666225000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666225000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361162880).

666225000 is an abundant number, since it is smaller than the sum of its proper divisors (2056100760).

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

666225000 is an equidigital number, since it uses as much as digits as its factorization.

666225000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 666225000 is about 25811.3347194600. The cubic root of 666225000 is about 873.3875064324.

Adding to 666225000 its reverse (522666), we get a palindrome (666747666).

The spelling of 666225000 in words is "six hundred sixty-six million, two hundred twenty-five thousand".