65665808 has 20 divisors (see below), whose sum is σ = 137014668. Its totient is φ = 30307200.

The previous prime is 65665771. The next prime is 65665811. The reversal of 65665808 is 80856656.

It can be written as a sum of positive squares in 2 ways, for example, as 32855824 + 32809984 = 5732^2 + 5728^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157643 + ... + 158058.

Almost surely, 2^65665808 is an apocalyptic number.

It is an amenable number.

65665808 is an abundant number, since it is smaller than the sum of its proper divisors (71348860).

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

65665808 is a wasteful number, since it uses less digits than its factorization.

65665808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315722 (or 315716 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 65665808 is about 8103.4442060151. Note that the first 3 decimals coincide. The cubic root of 65665808 is about 403.4407515423.

The spelling of 65665808 in words is "sixty-five million, six hundred sixty-five thousand, eight hundred eight".