65471816 has 8 divisors (see below), whose sum is σ = 122759670. Its totient is φ = 32735904.

The previous prime is 65471807. The next prime is 65471827. The reversal of 65471816 is 61817456.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 23716 = 8090^2 + 154^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 65471816.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4091981 + ... + 4091996.

Almost surely, 2^65471816 is an apocalyptic number.

It is an amenable number.

65471816 is a deficient number, since it is larger than the sum of its proper divisors (57287854).

65471816 is a wasteful number, since it uses less digits than its factorization.

65471816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8183983 (or 8183979 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 65471816 is about 8091.4656274373. The cubic root of 65471816 is about 403.0430738789.

The spelling of 65471816 in words is "sixty-five million, four hundred seventy-one thousand, eight hundred sixteen".