65606121 has 24 divisors (see below), whose sum is σ = 108867200. Its totient is φ = 37293696.

The previous prime is 65606113. The next prime is 65606147. The reversal of 65606121 is 12160656.

It is a happy number.

65606121 is a `hidden beast` number, since 656 + 0 + 6 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 65606121 - 2³ = 65606113 is a prime.

It is a super-5 number, since 5×65606121⁵ (a number of 40 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65606921) 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, 9921 + ... + 15153.

Almost surely, 2^65606121 is an apocalyptic number.

It is an amenable number.

65606121 is a deficient number, since it is larger than the sum of its proper divisors (43261079).

65606121 is a wasteful number, since it uses less digits than its factorization.

65606121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445 (or 5442 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 65606121 is about 8099.7605520163. The cubic root of 65606121 is about 403.3184785337.

Adding to 65606121 its reverse (12160656), we get a palindrome (77766777).

The spelling of 65606121 in words is "sixty-five million, six hundred six thousand, one hundred twenty-one".