65011681 has 24 divisors (see below), whose sum is σ = 78913536. Its totient is φ = 53343360.

The previous prime is 65011679. The next prime is 65011703. The reversal of 65011681 is 18611056.

It is not a de Polignac number, because 65011681 - 2¹ = 65011679 is a prime.

It is a super-2 number, since 2×65011681² = 8453037332891522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65011601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192745 + ... + 193081.

It is an arithmetic number, because the mean of its divisors is an integer number (3288064).

Almost surely, 2^65011681 is an apocalyptic number.

It is an amenable number.

65011681 is a deficient number, since it is larger than the sum of its proper divisors (13901855).

65011681 is a wasteful number, since it uses less digits than its factorization.

65011681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 65011681 is about 8062.9821406227. The cubic root of 65011681 is about 402.0966595945.

The spelling of 65011681 in words is "sixty-five million, eleven thousand, six hundred eighty-one".