65564537 has 4 divisors (see below), whose sum is σ = 65580900. Its totient is φ = 65548176.

The previous prime is 65564519. The next prime is 65564557. The reversal of 65564537 is 73546556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 56010256 + 9554281 = 7484^2 + 3091^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564537 - 2¹⁰ = 65563513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65564494 and 65564503.

It is not an unprimeable number, because it can be changed into a prime (65564507) 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 3 ways as a sum of consecutive naturals, for example, 2339 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (16395225).

Almost surely, 2^65564537 is an apocalyptic number.

It is an amenable number.

65564537 is a deficient number, since it is larger than the sum of its proper divisors (16363).

65564537 is an equidigital number, since it uses as much as digits as its factorization.

65564537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16362.

The product of its digits is 378000, while the sum is 41.

The square root of 65564537 is about 8097.1931556559. The cubic root of 65564537 is about 403.2332469520.

The spelling of 65564537 in words is "sixty-five million, five hundred sixty-four thousand, five hundred thirty-seven".