665954808 has 64 divisors (see below), whose sum is σ = 1702632960. Its totient is φ = 217003776.

The previous prime is 665954801. The next prime is 665954819. The reversal of 665954808 is 808459566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665954801) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 218785 + ... + 221807.

It is an arithmetic number, because the mean of its divisors is an integer number (26603640).

Almost surely, 2^665954808 is an apocalyptic number.

It is an amenable number.

665954808 is an abundant number, since it is smaller than the sum of its proper divisors (1036678152).

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

665954808 is a wasteful number, since it uses less digits than its factorization.

665954808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236 (or 3232 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 665954808 is about 25806.1002090591. The cubic root of 665954808 is about 873.2694210880.

The spelling of 665954808 in words is "six hundred sixty-five million, nine hundred fifty-four thousand, eight hundred eight".