65237561 has 2 divisors, whose sum is σ = 65237562. Its totient is φ = 65237560.

The previous prime is 65237531. The next prime is 65237563. The reversal of 65237561 is 16573256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 10758400 = 7381^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 65237561 - 2¹⁰ = 65236537 is a prime.

Together with 65237563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65237563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32618780 + 32618781.

It is an arithmetic number, because the mean of its divisors is an integer number (32618781).

Almost surely, 2^65237561 is an apocalyptic number.

It is an amenable number.

65237561 is a deficient number, since it is larger than the sum of its proper divisors (1).

65237561 is an equidigital number, since it uses as much as digits as its factorization.

65237561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 65237561 is about 8076.9772192325. The cubic root of 65237561 is about 402.5618098819.

The spelling of 65237561 in words is "sixty-five million, two hundred thirty-seven thousand, five hundred sixty-one".