65981759 has 2 divisors, whose sum is σ = 65981760. Its totient is φ = 65981758.

The previous prime is 65981731. The next prime is 65981761. The reversal of 65981759 is 95718956.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65981759 - 2¹⁶ = 65916223 is a prime.

It is a Sophie Germain prime.

Together with 65981761, 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 (65981789) 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, 32990879 + 32990880.

It is an arithmetic number, because the mean of its divisors is an integer number (32990880).

Almost surely, 2^65981759 is an apocalyptic number.

65981759 is a deficient number, since it is larger than the sum of its proper divisors (1).

65981759 is an equidigital number, since it uses as much as digits as its factorization.

65981759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 50.

The square root of 65981759 is about 8122.9156711122. The cubic root of 65981759 is about 404.0867681978.

The spelling of 65981759 in words is "sixty-five million, nine hundred eighty-one thousand, seven hundred fifty-nine".