665025000 has 96 divisors (see below), whose sum is σ = 2078304480. Its totient is φ = 177320000.

The previous prime is 665024977. The next prime is 665025017. The reversal of 665025000 is 520566.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 70567 + ... + 79433.

It is an arithmetic number, because the mean of its divisors is an integer number (21649005).

Almost surely, 2^665025000 is an apocalyptic number.

665025000 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 665025000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039152240).

665025000 is an abundant number, since it is smaller than the sum of its proper divisors (1413279480).

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

665025000 is an equidigital number, since it uses as much as digits as its factorization.

665025000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901 (or 8877 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 665025000 is about 25788.0786411086. The cubic root of 665025000 is about 872.8628113749.

Adding to 665025000 its reverse (520566), we get a palindrome (665545566).

The spelling of 665025000 in words is "six hundred sixty-five million, twenty-five thousand".