77422320961 has 2 divisors, whose sum is σ = 77422320962. Its totient is φ = 77422320960.

The previous prime is 77422320959. The next prime is 77422320973. The reversal of 77422320961 is 16902322477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58699598400 + 18722722561 = 242280^2 + 136831^2 .

It is an emirp because it is prime and its reverse (16902322477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77422320961 - 2¹ = 77422320959 is a prime.

Together with 77422320959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77422320061) 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, 38711160480 + 38711160481.

It is an arithmetic number, because the mean of its divisors is an integer number (38711160481).

Almost surely, 2^77422320961 is an apocalyptic number.

It is an amenable number.

77422320961 is a deficient number, since it is larger than the sum of its proper divisors (1).

77422320961 is an equidigital number, since it uses as much as digits as its factorization.

77422320961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 77422320961 in words is "seventy-seven billion, four hundred twenty-two million, three hundred twenty thousand, nine hundred sixty-one".