665811048 has 32 divisors (see below), whose sum is σ = 1902317760. Its totient is φ = 190231680.

The previous prime is 665811017. The next prime is 665811067. The reversal of 665811048 is 840118566.

It is a junction number, because it is equal to n+sod(n) for n = 665810997 and 665811015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1981413 + ... + 1981748.

It is an arithmetic number, because the mean of its divisors is an integer number (59447430).

Almost surely, 2^665811048 is an apocalyptic number.

It is an amenable number.

665811048 is an abundant number, since it is smaller than the sum of its proper divisors (1236506712).

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

665811048 is a wasteful number, since it uses less digits than its factorization.

665811048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963177 (or 3963173 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 665811048 is about 25803.3146707938. The cubic root of 665811048 is about 873.2065788626.

The spelling of 665811048 in words is "six hundred sixty-five million, eight hundred eleven thousand, forty-eight".