65985557056 has 28 divisors (see below), whose sum is σ = 130951998700. Its totient is φ = 32989777920.

The previous prime is 65985557041. The next prime is 65985557089. The reversal of 65985557056 is 65075558956.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32261907456 + 33723649600 = 179616^2 + 183640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65985556985 and 65985557003.

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 3 ways as a sum of consecutive naturals, for example, 773620 + ... + 854668.

Almost surely, 2^65985557056 is an apocalyptic number.

It is an amenable number.

65985557056 is a deficient number, since it is larger than the sum of its proper divisors (64966441644).

65985557056 is a wasteful number, since it uses less digits than its factorization.

65985557056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93782 (or 93772 counting only the distinct ones).

The product of its (nonzero) digits is 56700000, while the sum is 61.

The spelling of 65985557056 in words is "sixty-five billion, nine hundred eighty-five million, five hundred fifty-seven thousand, fifty-six".