665226000 has 320 divisors, whose sum is σ = 2426511360. Its totient is φ = 174182400.

The previous prime is 665225969. The next prime is 665226047. The reversal of 665226000 is 622566.

665226000 is a `hidden beast` number, since 6 + 6 + 52 + 2 + 600 + 0 = 666.

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

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 63 ways as a sum of consecutive naturals, for example, 5237937 + ... + 5238063.

It is an arithmetic number, because the mean of its divisors is an integer number (7582848).

Almost surely, 2^665226000 is an apocalyptic number.

665226000 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 665226000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1213255680).

665226000 is an abundant number, since it is smaller than the sum of its proper divisors (1761285360).

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

665226000 is a wasteful number, since it uses less digits than its factorization.

665226000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 234 counting only the distinct ones).

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

The square root of 665226000 is about 25791.9754962663. The cubic root of 665226000 is about 872.9507417797.

Adding to 665226000 its reverse (622566), we get a palindrome (665848566).

The spelling of 665226000 in words is "six hundred sixty-five million, two hundred twenty-six thousand".