665881284 has 48 divisors (see below), whose sum is σ = 1575826560. Its totient is φ = 218822400.

The previous prime is 665881259. The next prime is 665881291. The reversal of 665881284 is 482188566.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 317712 + ... + 319800.

It is an arithmetic number, because the mean of its divisors is an integer number (32829720).

Almost surely, 2^665881284 is an apocalyptic number.

It is an amenable number.

665881284 is an abundant number, since it is smaller than the sum of its proper divisors (909945276).

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

665881284 is a wasteful number, since it uses less digits than its factorization.

665881284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2458 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The square root of 665881284 is about 25804.6756228401. The cubic root of 665881284 is about 873.2372824588.

The spelling of 665881284 in words is "six hundred sixty-five million, eight hundred eighty-one thousand, two hundred eighty-four".