67956844865977 has 2 divisors, whose sum is σ = 67956844865978. Its totient is φ = 67956844865976.

The previous prime is 67956844865957. The next prime is 67956844865993. The reversal of 67956844865977 is 77956844865976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46788048752041 + 21168796113936 = 6840179^2 + 4600956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67956844865977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67956844865891 and 67956844865900.

It is not a weakly prime, because it can be changed into another prime (67956844865957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33978422432988 + 33978422432989.

It is an arithmetic number, because the mean of its divisors is an integer number (33978422432989).

Almost surely, 2^{67956844865977} is an apocalyptic number.

It is an amenable number.

67956844865977 is a deficient number, since it is larger than the sum of its proper divisors (1).

67956844865977 is an equidigital number, since it uses as much as digits as its factorization.

67956844865977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153628876800, while the sum is 91.

Subtracting 67956844865977 from its reverse (77956844865976), we obtain a palindrome (9999999999999).

The spelling of 67956844865977 in words is "sixty-seven trillion, nine hundred fifty-six billion, eight hundred forty-four million, eight hundred sixty-five thousand, nine hundred seventy-seven".