65765509 has 2 divisors, whose sum is σ = 65765510. Its totient is φ = 65765508.

The previous prime is 65765501. The next prime is 65765519. The reversal of 65765509 is 90556756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 2117025 = 7978^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 65765509 - 2³ = 65765501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65765501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32882754 + 32882755.

It is an arithmetic number, because the mean of its divisors is an integer number (32882755).

Almost surely, 2^65765509 is an apocalyptic number.

It is an amenable number.

65765509 is a deficient number, since it is larger than the sum of its proper divisors (1).

65765509 is an equidigital number, since it uses as much as digits as its factorization.

65765509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 283500, while the sum is 43.

The square root of 65765509 is about 8109.5936396345. The cubic root of 65765509 is about 403.6448308927.

It can be divided in two parts, 657 and 65509, that added together give a palindrome (66166).

The spelling of 65765509 in words is "sixty-five million, seven hundred sixty-five thousand, five hundred nine".