77608383889 has 2 divisors, whose sum is σ = 77608383890. Its totient is φ = 77608383888.

The previous prime is 77608383887. The next prime is 77608383961. The reversal of 77608383889 is 98838380677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75519436864 + 2088947025 = 274808^2 + 45705^2 .

It is a cyclic number.

It is not a de Polignac number, because 77608383889 - 2¹ = 77608383887 is a prime.

It is a super-2 number, since 2×77608383889² (a number of 23 digits) contains 22 as substring.

Together with 77608383887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77608383887) 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, 38804191944 + 38804191945.

It is an arithmetic number, because the mean of its divisors is an integer number (38804191945).

Almost surely, 2^77608383889 is an apocalyptic number.

It is an amenable number.

77608383889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77608383889 is an equidigital number, since it uses as much as digits as its factorization.

77608383889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97542144, while the sum is 67.

The spelling of 77608383889 in words is "seventy-seven billion, six hundred eight million, three hundred eighty-three thousand, eight hundred eighty-nine".