65001681 has 24 divisors (see below), whose sum is σ = 97084416. Its totient is φ = 41882400.

The previous prime is 65001619. The next prime is 65001689. The reversal of 65001681 is 18610056.

65001681 is a `hidden beast` number, since 650 + 0 + 1 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 65001681 - 2¹⁰ = 65000657 is a prime.

It is a super-2 number, since 2×65001681² = 8450437065651522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65001689) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 38256 + ... + 39918.

It is an arithmetic number, because the mean of its divisors is an integer number (4045184).

Almost surely, 2^65001681 is an apocalyptic number.

It is an amenable number.

65001681 is a deficient number, since it is larger than the sum of its proper divisors (32082735).

65001681 is a wasteful number, since it uses less digits than its factorization.

65001681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 65001681 is about 8062.3619988190. The cubic root of 65001681 is about 402.0760419008.

The spelling of 65001681 in words is "sixty-five million, one thousand, six hundred eighty-one".