65796781 has 2 divisors, whose sum is σ = 65796782. Its totient is φ = 65796780.

The previous prime is 65796733. The next prime is 65796793. The reversal of 65796781 is 18769756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47734281 + 18062500 = 6909^2 + 4250^2 .

It is a cyclic number.

It is not a de Polignac number, because 65796781 - 2²³ = 57408173 is a prime.

It is a super-2 number, since 2×65796781² = 8658432779923922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65796701) 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, 32898390 + 32898391.

It is an arithmetic number, because the mean of its divisors is an integer number (32898391).

Almost surely, 2^65796781 is an apocalyptic number.

It is an amenable number.

65796781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65796781 is an equidigital number, since it uses as much as digits as its factorization.

65796781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 65796781 is about 8111.5214972285. The cubic root of 65796781 is about 403.7087994842.

The spelling of 65796781 in words is "sixty-five million, seven hundred ninety-six thousand, seven hundred eighty-one".