65112561 has 6 divisors (see below), whose sum is σ = 94051490. Its totient is φ = 43408368.

The previous prime is 65112557. The next prime is 65112571. The reversal of 65112561 is 16521156.

It is a happy number.

65112561 is a `hidden beast` number, since 651 + 1 + 2 + 5 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 18326961 = 6840^2 + 4281^2 .

It is not a de Polignac number, because 65112561 - 2² = 65112557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65112571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3617356 + ... + 3617373.

Almost surely, 2^65112561 is an apocalyptic number.

It is an amenable number.

65112561 is a deficient number, since it is larger than the sum of its proper divisors (28938929).

65112561 is a wasteful number, since it uses less digits than its factorization.

65112561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7234735 (or 7234732 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 65112561 is about 8069.2354656436. The cubic root of 65112561 is about 402.3045327407.

The spelling of 65112561 in words is "sixty-five million, one hundred twelve thousand, five hundred sixty-one".