65481681 has 16 divisors (see below), whose sum is σ = 91857600. Its totient is φ = 41431488.

The previous prime is 65481673. The next prime is 65481697. The reversal of 65481681 is 18618456.

It is not a de Polignac number, because 65481681 - 2³ = 65481673 is a prime.

It is a super-2 number, since 2×65481681² = 8575701093171522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65481631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246 + ... + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (5741100).

Almost surely, 2^65481681 is an apocalyptic number.

It is an amenable number.

65481681 is a deficient number, since it is larger than the sum of its proper divisors (26375919).

65481681 is a wasteful number, since it uses less digits than its factorization.

65481681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12848.

The product of its digits is 46080, while the sum is 39.

The square root of 65481681 is about 8092.0751973768. The cubic root of 65481681 is about 403.0633157707.

The spelling of 65481681 in words is "sixty-five million, four hundred eighty-one thousand, six hundred eighty-one".