665817152 has 224 divisors, whose sum is σ = 1870740480. Its totient is φ = 226437120.

The previous prime is 665817151. The next prime is 665817193. The reversal of 665817152 is 251718566.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×665817152² = 886624959794782208, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665817151) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1216943 + ... + 1217489.

It is an arithmetic number, because the mean of its divisors is an integer number (8351520).

Almost surely, 2^665817152 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 665817152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935370240).

665817152 is an abundant number, since it is smaller than the sum of its proper divisors (1204923328).

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

665817152 is a wasteful number, since it uses less digits than its factorization.

665817152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 599 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 665817152 is about 25803.4329499003. The cubic root of 665817152 is about 873.2092473056.

The spelling of 665817152 in words is "six hundred sixty-five million, eight hundred seventeen thousand, one hundred fifty-two".