777985307977 has 2 divisors, whose sum is σ = 777985307978. Its totient is φ = 777985307976.

The previous prime is 777985307969. The next prime is 777985307993. The reversal of 777985307977 is 779703589777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611642869776 + 166342438201 = 782076^2 + 407851^2 .

It is a cyclic number.

It is not a de Polignac number, because 777985307977 - 2³ = 777985307969 is a prime.

It is a super-2 number, since 2×777985307977² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (777985307947) 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, 388992653988 + 388992653989.

It is an arithmetic number, because the mean of its divisors is an integer number (388992653989).

Almost surely, 2^777985307977 is an apocalyptic number.

It is an amenable number.

777985307977 is a deficient number, since it is larger than the sum of its proper divisors (1).

777985307977 is an equidigital number, since it uses as much as digits as its factorization.

777985307977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143548280, while the sum is 76.

The spelling of 777985307977 in words is "seven hundred seventy-seven billion, nine hundred eighty-five million, three hundred seven thousand, nine hundred seventy-seven".