636320120077 has 2 divisors, whose sum is σ = 636320120078. Its totient is φ = 636320120076.

The previous prime is 636320120041. The next prime is 636320120081. The reversal of 636320120077 is 770021023636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620611508521 + 15708611556 = 787789^2 + 125334^2 .

It is a cyclic number.

It is not a de Polignac number, because 636320120077 - 2¹⁹ = 636319595789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636320129077) 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, 318160060038 + 318160060039.

It is an arithmetic number, because the mean of its divisors is an integer number (318160060039).

Almost surely, 2^636320120077 is an apocalyptic number.

It is an amenable number.

636320120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

636320120077 is an equidigital number, since it uses as much as digits as its factorization.

636320120077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 636320120077 in words is "six hundred thirty-six billion, three hundred twenty million, one hundred twenty thousand, seventy-seven".