65639744077 has 2 divisors, whose sum is σ = 65639744078. Its totient is φ = 65639744076.

The previous prime is 65639744063. The next prime is 65639744117. The reversal of 65639744077 is 77044793656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35900396676 + 29739347401 = 189474^2 + 172451^2 .

It is a cyclic number.

It is not a de Polignac number, because 65639744077 - 2¹¹ = 65639742029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65639744377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32819872038 + 32819872039.

It is an arithmetic number, because the mean of its divisors is an integer number (32819872039).

Almost surely, 2^65639744077 is an apocalyptic number.

It is an amenable number.

65639744077 is a deficient number, since it is larger than the sum of its proper divisors (1).

65639744077 is an equidigital number, since it uses as much as digits as its factorization.

65639744077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26671680, while the sum is 58.

The spelling of 65639744077 in words is "sixty-five billion, six hundred thirty-nine million, seven hundred forty-four thousand, seventy-seven".