65405761 has 2 divisors, whose sum is σ = 65405762. Its totient is φ = 65405760.

The previous prime is 65405723. The next prime is 65405779. The reversal of 65405761 is 16750456.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 17172736 = 6945^2 + 4144^2 .

It is a cyclic number.

It is not a de Polignac number, because 65405761 - 2⁷ = 65405633 is a prime.

It is not a weakly prime, because it can be changed into another prime (65405161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32702880 + 32702881.

It is an arithmetic number, because the mean of its divisors is an integer number (32702881).

Almost surely, 2^65405761 is an apocalyptic number.

It is an amenable number.

65405761 is a deficient number, since it is larger than the sum of its proper divisors (1).

65405761 is an equidigital number, since it uses as much as digits as its factorization.

65405761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 65405761 is about 8087.3828275901. The cubic root of 65405761 is about 402.9074838888.

It can be divided in two parts, 65405 and 761, that added together give a palindrome (66166).

The spelling of 65405761 in words is "sixty-five million, four hundred five thousand, seven hundred sixty-one".