65415681 has 20 divisors (see below), whose sum is σ = 99804672. Its totient is φ = 42680088.

The previous prime is 65415671. The next prime is 65415683. The reversal of 65415681 is 18651456.

It is not a de Polignac number, because 65415681 - 2⁶ = 65415617 is a prime.

It is a super-2 number, since 2×65415681² = 8558422641387522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65415683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4785 + ... + 12398.

Almost surely, 2^65415681 is an apocalyptic number.

It is an amenable number.

65415681 is a deficient number, since it is larger than the sum of its proper divisors (34388991).

65415681 is a wasteful number, since it uses less digits than its factorization.

65415681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17242 (or 17233 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 65415681 is about 8087.9961053403. The cubic root of 65415681 is about 402.9278523300.

The spelling of 65415681 in words is "sixty-five million, four hundred fifteen thousand, six hundred eighty-one".