665469216 has 96 divisors (see below), whose sum is σ = 2055170880. Its totient is φ = 208770048.

The previous prime is 665469197. The next prime is 665469221. The reversal of 665469216 is 612964566.

665469216 is a `hidden beast` number, since 6 + 6 + 546 + 92 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7966 + ... + 37341.

It is an arithmetic number, because the mean of its divisors is an integer number (21408030).

Almost surely, 2^665469216 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 665469216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027585440).

665469216 is an abundant number, since it is smaller than the sum of its proper divisors (1389701664).

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

665469216 is a wasteful number, since it uses less digits than its factorization.

665469216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45343 (or 45329 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 665469216 is about 25796.6900202332. The cubic root of 665469216 is about 873.0571165143.

The spelling of 665469216 in words is "six hundred sixty-five million, four hundred sixty-nine thousand, two hundred sixteen".