65500661 has 2 divisors, whose sum is σ = 65500662. Its totient is φ = 65500660.

The previous prime is 65500649. The next prime is 65500663. The reversal of 65500661 is 16600556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 11771761 = 7330^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 65500661 - 2¹⁸ = 65238517 is a prime.

Together with 65500663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65500663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32750330 + 32750331.

It is an arithmetic number, because the mean of its divisors is an integer number (32750331).

Almost surely, 2^65500661 is an apocalyptic number.

It is an amenable number.

65500661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65500661 is an equidigital number, since it uses as much as digits as its factorization.

65500661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 65500661 is about 8093.2478647327. The cubic root of 65500661 is about 403.1022549193.

The spelling of 65500661 in words is "sixty-five million, five hundred thousand, six hundred sixty-one".