65040561 has 24 divisors (see below), whose sum is σ = 97130280. Its totient is φ = 41907456.

The previous prime is 65040557. The next prime is 65040571. The reversal of 65040561 is 16504056.

It is a happy number.

65040561 is a `hidden beast` number, since 65 + 0 + 40 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21678336 + 43362225 = 4656^2 + 6585^2 .

It is not a de Polignac number, because 65040561 - 2² = 65040557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65040571) 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, 57045 + ... + 58173.

It is an arithmetic number, because the mean of its divisors is an integer number (4047095).

Almost surely, 2^65040561 is an apocalyptic number.

It is an amenable number.

65040561 is a deficient number, since it is larger than the sum of its proper divisors (32089719).

65040561 is a wasteful number, since it uses less digits than its factorization.

65040561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65040561 is about 8064.7728424302. The cubic root of 65040561 is about 402.1561916265.

The spelling of 65040561 in words is "sixty-five million, forty thousand, five hundred sixty-one".