665848512 has 280 divisors, whose sum is σ = 2301361920. Its totient is φ = 186416640.

The previous prime is 665848511. The next prime is 665848517. The reversal of 665848512 is 215848566.

665848512 is a `hidden beast` number, since 66 + 584 + 8 + 5 + 1 + 2 = 666.

It is a super-2 number, since 2×665848512² = 886708481865228288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665848511) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 2140837 + ... + 2141147.

Almost surely, 2^665848512 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 665848512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150680960).

665848512 is an abundant number, since it is smaller than the sum of its proper divisors (1635513408).

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

665848512 is a wasteful number, since it uses less digits than its factorization.

665848512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 382 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 665848512 is about 25804.0406138264. The cubic root of 665848512 is about 873.2229564809. Note that the first 3 decimals are identical.

The spelling of 665848512 in words is "six hundred sixty-five million, eight hundred forty-eight thousand, five hundred twelve".