65891816 has 8 divisors (see below), whose sum is σ = 123547170. Its totient is φ = 32945904.

The previous prime is 65891807. The next prime is 65891843. The reversal of 65891816 is 61819856.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 119716 = 8110^2 + 346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 4118231 + ... + 4118246.

Almost surely, 2^65891816 is an apocalyptic number.

It is an amenable number.

65891816 is a deficient number, since it is larger than the sum of its proper divisors (57655354).

65891816 is a wasteful number, since it uses less digits than its factorization.

65891816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8236483 (or 8236479 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 65891816 is about 8117.3774089912. The cubic root of 65891816 is about 403.9030744835.

The spelling of 65891816 in words is "sixty-five million, eight hundred ninety-one thousand, eight hundred sixteen".