65516661 has 16 divisors (see below), whose sum is σ = 110928000. Its totient is φ = 37437984.

The previous prime is 65516653. The next prime is 65516663. The reversal of 65516661 is 16661556.

It is not a de Polignac number, because 65516661 - 2³ = 65516653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65516663) 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 15 ways as a sum of consecutive naturals, for example, 173136 + ... + 173513.

It is an arithmetic number, because the mean of its divisors is an integer number (6933000).

Almost surely, 2^65516661 is an apocalyptic number.

It is an amenable number.

65516661 is a deficient number, since it is larger than the sum of its proper divisors (45411339).

65516661 is a wasteful number, since it uses less digits than its factorization.

65516661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346665 (or 346659 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 65516661 is about 8094.2362826891. The cubic root of 65516661 is about 403.1350744913.

The spelling of 65516661 in words is "sixty-five million, five hundred sixteen thousand, six hundred sixty-one".