65205081 has 20 divisors (see below), whose sum is σ = 103137012. Its totient is φ = 40912128.

The previous prime is 65205073. The next prime is 65205097. The reversal of 65205081 is 18050256.

65205081 is a `hidden beast` number, since 652 + 0 + 5 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25401600 + 39803481 = 5040^2 + 6309^2 .

It is not a de Polignac number, because 65205081 - 2³ = 65205073 is a prime.

It is a super-2 number, since 2×65205081² = 8503405176433122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (65205011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22300 + ... + 25053.

Almost surely, 2^65205081 is an apocalyptic number.

It is an amenable number.

65205081 is a deficient number, since it is larger than the sum of its proper divisors (37931931).

65205081 is a wasteful number, since it uses less digits than its factorization.

65205081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47382 (or 47373 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 65205081 is about 8074.9663157192. The cubic root of 65205081 is about 402.4949906145.

The spelling of 65205081 in words is "sixty-five million, two hundred five thousand, eighty-one".